131 + Interview Questions in Cell : The Unit Of Life in Biology

1.	Which of these statements is false regarding lysosomes?(a) They are bound by a single membrane(b) They contain hydrolytic enzymes(c) Lysosomal enzymes are active at a basic pH(d) They can digest nucleic acidsI have been asked this question during an interview.This interesting question is from Eukaryotic Cells and it’s Organelles topic in portion Cell : The Unit of Life of Biology – Class 11
Answer» Correct option is (c) LYSOSOMAL enzymes are active at a basic pH The explanation is: Lysosomes are bound by a single MEMBRANE. The CONTAIN hydrolytic enzymes which are active at an acidic pH and digest SUBSTANCES such as carbohydrates, proteins, lipids and nucleic acids, by hydrolysis.

Discussion

2.	Which of these is an important constituent of the nuclear matrix?(a) Chromatin(b) Ribosomes(c) Mitochondria(d) CentrosomesThis question was addressed to me in an interview for internship.My question comes from Cell in section Cell : The Unit of Life of Biology – Class 11
Answer» RIGHT option is (a) CHROMATIN The explanation is: The nuclear MATRIX or the nucleoplasm contains the nucleolus and chromatin. The nucleoli are spherical STRUCTURES present in the nucleoplasm and the chromatin is present ALONG with it.

Discussion

3.	The structure of the cell membrane was studied in detail after the invention of the _____(a) electron microscope(b) light microscope(c) magnifying glass(d) confocal microscopeThe question was asked by my college professor while I was bunking the class.The query is from Eukaryotic Cells and it’s Organelles in portion Cell : The Unit of Life of Biology – Class 11
Answer» The correct ANSWER is (a) electron microscope For explanation I would say: The STRUCTURE of the cell MEMBRANE was studied in DETAIL in the 1950s after the advent of the electron microscope. The cell membrane is a phospholipid bilayer containing various proteins in its structure.

Discussion

4.	Which of these bacteria have chromatophores?(a) Escherichia(b) Mycobacteria(c) Mycoplasma(d) CyanobacteriaThe question was posed to me in an interview for job.Origin of the question is Prokaryotic Cells topic in section Cell : The Unit of Life of Biology – Class 11
Answer» Right CHOICE is (d) Cyanobacteria Explanation: Chromatophores are PIGMENT containing membranous EXTENSIONS in the cytoplasm of BACTERIA. Cyanobacteria contain chromatophores. They are photosynthetic bacteria that are aquatic in NATURE.

Discussion

5.	What are plasmid made of?(a) Proteins(b) Polysaccharides(c) Nucleic acids(d) LipidsI have been asked this question in an online quiz.This intriguing question originated from Prokaryotic Cells in chapter Cell : The Unit of Life of Biology – Class 11
Answer» The CORRECT option is (c) Nucleic ACIDS For explanation I would SAY: Plasmids are made of nucleic acids. They are extrachromosomal small circular DNA that is present in BACTERIAL cell, apart from the genomic DNA. Plasmid DNA confers several SPECIAL features to the cell.

Discussion

6.	Theodore Schwann was a _____(a) British zoologist(b) German zoologist(c) British botanist(d) German botanistThe question was posed to me in an online interview.My query is from Cell Theory in division Cell : The Unit of Life of Biology – Class 11
Answer» CORRECT option is (a) British zoologist To explain: Theodore Schwann was a British zoologist. He studied various types of animal cells. From his findings, the concluded that every CELL had a thin outer LAYER which is the plasma MEMBRANE.

Discussion

7.	What is the site of rRNA synthesis within a cell?(a) Chromatin(b) Nucleolus(c) Perinuclear space(d) CentrosomesThe question was asked in semester exam.My question is based upon Cell topic in section Cell : The Unit of Life of Biology – Class 11
Answer» The correct ANSWER is (b) NUCLEOLUS Easy explanation: The NUCLEAR matrix or the NUCLEOPLASM contains the nucleolus and chromatin. The nucleolus is the site for active ribosomal RNA or rRNA synthesis. The nucleolus is not bound by a membrane.

Discussion

8.	What is the site of production of lipid-like steroidal hormones in animal cells?(a) Mitochondria(b) Nucleus(c) Peroxisomes(d) Smooth endoplasmic reticulumThe question was asked during an internship interview.I would like to ask this question from Eukaryotic Cells and it’s Organelles topic in chapter Cell : The Unit of Life of Biology – Class 11
Answer» Right ANSWER is (d) Smooth endoplasmic reticulum Explanation: Smooth endoplasmic reticulum is the SITE of synthesis of lipid-like STEROIDAL hormones. It is the major site for the PRODUCTION of lipids. Rough endoplasmic reticulum is the site of synthesis of PROTEINS.

Discussion

9.	What is the space inside the endoplasmic reticulum called?(a) Tubular compartment(b) Extra – tubular compartment(c) Luminal compartment(d) Extra – luminal compartmentI had been asked this question in an interview for internship.This is a very interesting question from Eukaryotic Cells and it’s Organelles topic in division Cell : The Unit of Life of Biology – Class 11
Answer» The correct choice is (C) Luminal compartment Best explanation: The endoplasmic reticulum is an ORGANELLE WHOSE MEMBRANE is continuous with the membrane of the NUCLEUS. It divides the intracellular space into two compartments – luminal and extra – luminal.

Discussion

10.	Which of these structures is not a part of the bacterial flagella?(a) Filament(b) Basal Body(c) Lamina(d) HookI got this question at a job interview.This is a very interesting question from Prokaryotic Cells topic in portion Cell : The Unit of Life of Biology – Class 11
Answer» Correct CHOICE is (c) Lamina The explanation: Motile bacteria have a thin filamentous structure extending from the cell known as the flagella. Flagella are made of three PARTS – the filament which is the LONGEST PORTION, the hook and the basal BODY.

Discussion

11.	Which among the following is incorrect about cell wall?(a) Cell wall provides mechanical supports and avoids rupture of cell in a hypotonic solution(b) Plasmodesmata are protein granules in the cell wall that provides mechanical support(c) Cell wall prevents the cell from invasion and injury(d) Cell wall is entirely permeable and rigidI got this question in quiz.I would like to ask this question from Cell Basics topic in chapter Cell : The Unit of Life of Biology – Class 11
Answer» Right choice is (b) Plasmodesmata are protein GRANULES in the cell WALL that provides mechanical support The best I can explain: Cell wall provides mechanical supports and avoids rupture of cell in a hypotonic solution. Plasmodesmata are tiny hole like structures that connects the cell WALLS of adjacent cells and facilitates communication between the cells. Cell wall is entirely PERMEABLE and rigid.

Discussion

12.	What forms the basal body of flagella?(a) Axoneme(b) Centrioles(c) Keratin(d) Calcium carbonateThis question was posed to me during an online exam.Question is taken from Eukaryotic Cells and it’s Organelles in portion Cell : The Unit of Life of Biology – Class 11
Answer» Correct choice is (b) Centrioles Easiest EXPLANATION: Centrosome is a cell ORGANELLE containing TWO structures cylindrical in shape, called centrioles. Centrioles lie PERPENDICULAR to each other. They also form the basal body of cilia and FLAGELLA.

Discussion

13.	Which of these are absent in plant cell?(a) Large central vacuole(b) Cell wall(c) Centriole(d) PlastidThe question was asked in an interview.The question is from Eukaryotic Cells and it’s Organelles in division Cell : The Unit of Life of Biology – Class 11
Answer» CORRECT answer is (c) Centriole The explanation: Plants cells are differentiated from ANIMAL cells on the basis of the PRESENCE of certain ORGANELLES such as plastids, cell wall and a large central vacuole. Only animal cells possess centrioles in their cytoplasm.

Discussion

14.	Which among the following is incorrect about prokaryotic cell?(a) In prokaryotic cell, cell compartmentalization is absent(b) Genetic material is scattered in the nucleus(c) Protista is an example of prokaryotic cell(d) Prokaryotic cell has a cell membraneI had been asked this question in an interview for job.This intriguing question comes from Organelles in Eukaryotic and Prokaryotic Cells topic in division Cell : The Unit of Life of Biology – Class 11
Answer» The correct option is (c) Protista is an example of PROKARYOTIC CELL Easiest explanation: In prokaryotic cell, cell compartmentalization is ABSENT. Genetic material is scattered in the nucleus. Protista is an example of eukaryotic cell. Monera and ARCHAEBACTERIA are examples of prokaryotic cells. Prokaryotic cell has a cell MEMBRANE along with glycocalyx.

Discussion

15.	Which of these statements is false regarding Theodore Schwann?(a) He was a British zoologist(b) He studied various types of animal cells and observed the plasma membrane(c) He concluded that animal and plant cells have cell walls(d) He hypothesized that animals and plants were made of cells and cellular productsI had been asked this question during an interview.The question is from Cell Theory in division Cell : The Unit of Life of Biology – Class 11
Answer» Right option is (c) He concluded that animal and plant cells have cell WALLS The explanation is: Theodore Schwann was a British zoologist. He STUDIED VARIOUS TYPES of animal cells and the observed the plasma membrane. He concluded that only plant cells had cell walls. He hypothesized that all animals and plants were made of cells and their PRODUCTS.

Discussion

16.	What are the disc shaped structures located on the sides of the centromere?(a) Kinetochores(b) Satellite cells(c) Flagella(d) RibosomesI have been asked this question in my homework.This interesting question is from Cell topic in section Cell : The Unit of Life of Biology – Class 11
Answer» The correct ANSWER is (a) KINETOCHORES The explanation: Every chromosome has a primary constriction known as the CENTROMERE. The sides of the centromere CONTAINS disc SHAPED structures known as kinetochores.

Discussion

17.	How many microtubules does the axoneme contain?(a) 6 + 5(b) 8 + 3(c) 9 + 2(d) 7 + 4I have been asked this question during an interview.I would like to ask this question from Eukaryotic Cells and it’s Organelles topic in section Cell : The Unit of Life of Biology – Class 11
Answer» The correct answer is (c) 9 + 2 Explanation: FLAGELLA are THIN long hair – like GROWTHS of the cell MEMBRANE. The flagellar core is called the axoneme which has microtubules RUNNING parallel to the long axis. It contains 9 + 2 axonemal microtubules.

Discussion

18.	Which of these statements is not true regarding rough endoplasmic reticulum?(a) The inner compartment is called the tubular compartment(b) It is involved in protein synthesis(c) Ribosomes are attached to its outer surface(d) Its membrane is continuous with the outer membrane of the nucleusThe question was asked during an internship interview.The question is from Eukaryotic Cells and it’s Organelles in division Cell : The Unit of Life of Biology – Class 11
Answer» The correct option is (a) The inner compartment is called the tubular compartment Easiest explanation: The inner compartment of the ROUGH ENDOPLASMIC RETICULUM is called the luminal compartment. The RIBOSOMES are ATTACHED to the outer surface and it is actively involved in protein synthesis.

Discussion

19.	What is present on the surface of the rough endoplasmic reticulum?(a) Ribosomes(b) Peroxisomes(c) Lysosomes(d) EndosomesI got this question by my college professor while I was bunking the class.My question is taken from Eukaryotic Cells and it’s Organelles topic in portion Cell : The Unit of Life of Biology – Class 11
Answer» Correct choice is (a) RIBOSOMES To explain: Endoplasmic RETICULUM is of TWO types- smooth endoplasmic reticulum and rough endoplasmic reticulum. The rough endoplasmic reticulum has ribosomes present on its outer surface.

Discussion

20.	Which of these is the main component of the middle lamella?(a) Calcium phosphate(b) Calcium silicate(c) Calcium carbonate(d) Calcium pectateI got this question in an interview.The above asked question is from Eukaryotic Cells and it’s Organelles topic in division Cell : The Unit of Life of Biology – Class 11
Answer» Correct option is (d) Calcium pectate Best explanation: The middle lamella is a LAYER present between two plant CELLS which joins the cell WALLS of both the cells. It is the first layer which is formed and deposited during cytokinesis. It MAINLY CONTAINS calcium pectate.

Discussion

21.	What is the percentage of protein in the cell membrane of human erythrocytes?(a) 52%(b) 40%(c) 37%(d) 33%I got this question during an interview.I want to ask this question from Eukaryotic Cells and it’s Organelles topic in division Cell : The Unit of Life of Biology – Class 11
Answer» Correct option is (a) 52% EASIEST explanation: The CELL membrane is a phospholipid bilayer. It also contains various proteins. The protein and lipid percentages VARY in different cells. Human ERYTHROCYTE membranes are 52% protein.

Discussion

22.	Gram negative bacteria take up gram strain. True or false?(a) True(b) FalseI have been asked this question during an interview.I would like to ask this question from Prokaryotic Cells topic in chapter Cell : The Unit of Life of Biology – Class 11
Answer» CORRECT answer is (B) False Easiest explanation: Bacteria are classified into Gram – positive bacteria and Gram – negative bacteria on the basis of their response to a STAINING procedure known as Gram staining. Gram positive bacteria take up gram strain.

Discussion

23.	Who gave the final shape to the cell theory?(a) Antony Von Leeuwenhoek(b) Matthias Schleiden(c) Rudolph Virchow(d) Theodore SchwannThis question was posed to me in quiz.The question is from Cell Theory topic in section Cell : The Unit of Life of Biology – Class 11
Answer» Correct choice is (c) Rudolph Virchow For explanation I WOULD say: Matthias Schleiden, a German botanist and THEODORE Schwann, a British zoologist together formulated the cell theory. Rudolph Virchow introduced his theory of OMNIS CELLULA-e cellula, thus giving the FINAL shape to the cell theory.

Discussion

24.	How many layers are present in the bacterial cell envelope?(a) 1(b) 2(c) 3(d) 4This question was posed to me during an interview.My doubt stems from Prokaryotic Cells topic in division Cell : The Unit of Life of Biology – Class 11
Answer» CORRECT answer is (c) 3 The best explanation: Bacterial have a TIGHTLY bound three – layered cell envelope. The uppermost layer is the glycocalyx, followed by the cell wall in the middle and the innermost plasma membrane. The cell envelope PROVIDES protection.

Discussion

25.	Which among the following is incorrect about lysosomes?(a) These are membrane bound vesicles that contain digestive enzymes(b) They are double membraned and are isolated from their neighboring environment(c) The digestive enzymes present include proteases, lipases, nucleases, glycosidases and phosphatases(d) The lysosomes defend against bacterial and viral infectionI had been asked this question in homework.My question is based upon Organelles in Eukaryotic and Prokaryotic Cells in section Cell : The Unit of Life of Biology – Class 11
Answer» CORRECT choice is (a) These are membrane bound vesicles that contain digestive enzymes The explanation is: Lysosomes are membrane bound vesicles that contain digestive enzymes. They are SINGLE membraned and are isolated from their neighboring environment. The digestive enzymes present include proteases, lipases, nucleases, GLYCOSIDASES and PHOSPHATASES. The lysosomes defend against BACTERIAL and viral infection.

Discussion

26.	Cells are the structural unit of life and all the organisms are made of cells.(a) True(b) FalseThe question was asked in an internship interview.I need to ask this question from Cell Basics in division Cell : The Unit of Life of Biology – Class 11
Answer» Correct choice is (a) True The EXPLANATION is: Cells are the structural UNIT of life and all the organisms are MADE of cells. The size and SHAPES of the cells vary with organisms and their functions but on a WHOLE most of them have identical components.

Discussion

27.	Which among the following statements is incorrect about plasma membrane?(a) Plasma membrane is a selectively permeable membrane and allows only those particles that protect the cell(b) Movement of air and water takes place through diffusion and osmosis respectively(c) Osmosis and diffusion are examples of active transport(d) Active transport takes place through use of energyThe question was asked in quiz.Query is from Cell Basics in division Cell : The Unit of Life of Biology – Class 11
Answer» Correct answer is (c) Osmosis and diffusion are examples of active TRANSPORT To explain: Plasma membrane is a selectively permeable membrane and allows only those particles that PROTECT the cell. Movement of AIR and water takes place through diffusion and osmosis respectively. Osmosis and diffusion are examples of passive transport. Active transport takes place through use of ENERGY.

Discussion

28.	Which among the following is incorrect about different types of cells?(a) Size and shape of the cells vary with the functions they perform(b) In unicellular organism a single cell constitutes the entire organism(c) The components in all eukaryotic cells are more/less the same(d) Centrioles are present in plant cells but absent in animal cellsThe question was posed to me in my homework.Question is from Cell Basics topic in portion Cell : The Unit of Life of Biology – Class 11
Answer» Correct OPTION is (d) Centrioles are present in plant cells but absent in animal cells The explanation: SIZE and shape of the cells vary with the functions they PERFORM. In unicellular organism a single cell constitutes the entire organism. The components in all EUKARYOTIC cells are more/less the same. Centrioles are present in animal cells but absent in plant cells.

Discussion

29.	Which of these cells lack a nucleus?(a) Thrombocytes in humans(b) Lymphocytes of primates(c) Sieve tube cells of vascular plants(d) Epithelial cellsThis question was posed to me during an interview.Asked question is from Cell in portion Cell : The Unit of Life of Biology – Class 11
Answer» The CORRECT ANSWER is (c) Sieve tube cells of vascular plants The best I can explain: Some cells such as the red blood cells or the erythrocytes of HUMANS and the sieve tube cells of vascular plants LACK a nucleus in their mature cells. Leukocytes and thrombocytes POSSESS a nucleus.

Discussion

30.	What is the shape of a centriole?(a) Irregular(b) Spherical(c) Cylindrical(d) CuboidalI have been asked this question at a job interview.Question is from Eukaryotic Cells and it’s Organelles in section Cell : The Unit of Life of Biology – Class 11
Answer» The correct answer is (c) Cylindrical For explanation: Centrosome is a cell organelle containing two structures cylindrical in shape, called centrioles. Centrioles lie PERPENDICULAR to each other. The centrioles are composed of TUBULIN PROTEIN.

Discussion

31.	What is the space between the two membranes of the nuclear envelope known as?(a) Reticular space(b) Intra – membrane space(c) Perinuclear space(d) Somatic spaceThis question was addressed to me in a national level competition.Origin of the question is Cell in section Cell : The Unit of Life of Biology – Class 11
Answer» CORRECT ANSWER is (c) Perinuclear space To elaborate: Electron microscopy has revealed that the nuclear ENVELOPE CONSISTS of two PARALLEL membranes with a space between them called the perinuclear space. It forms a barrier between the materials present inside the nucleus and that of the cytoplasm.

Discussion

32.	How many chloroplasts are present in each cell of Chlamydomonas?(a) 1(b) 2(c) 3(d) 4This question was posed to me in final exam.This is a very interesting question from Eukaryotic Cells and it’s Organelles topic in division Cell : The Unit of Life of Biology – Class 11
Answer» Correct option is (a) 1 The best I can explain: Chloroplasts are plastids CONTAINING the green PIGMENT chlorophyll, which is necessary to TRAP SUNLIGHT to carry out the process of photosynthesis. Chlamydomonas has only one chloroplast per CELL.

Discussion

33.	Where is 70S ribosome found in the animal cell?(a) Inside the nucleus(b) Surface of rough endoplasmic reticulum(c) Inside mitochondria(d) In the cytoplasmI had been asked this question during an online interview.This interesting question is from Eukaryotic Cells and it’s Organelles in division Cell : The Unit of Life of Biology – Class 11
Answer» Right answer is (c) INSIDE mitochondria To explain I would say: Apart from the genomic DNA present inside the NUCLEUS, the mitochondria POSSESSES its own genetic material in the form of a single circular DNA molecule. It also possesses 70S (prokaryotic) ribosomes.

Discussion

34.	The secondary wall of the cell wall faces the adjacent plant cell. True or false?(a) True(b) FalseThis question was posed to me by my school principal while I was bunking the class.My question is from Eukaryotic Cells and it’s Organelles topic in division Cell : The Unit of Life of Biology – Class 11
Answer» RIGHT choice is (b) False Explanation: The SECONDARY wall of the cell wall does not FACE the adjacent plant cell. It grows inwards, hence facing the cell MEMBRANE of the same cell. It diminishes the growth of the cell wall of young cells.

Discussion

35.	Which of these scientists did not contribute to the cell theory?(a) Robert Koch(b) Matthias Schleiden(c) Theodore Schwann(d) Rudolph VirchowThe question was asked in an online quiz.My query is from Cell Theory in portion Cell : The Unit of Life of Biology – Class 11
Answer» The correct answer is (a) ROBERT Koch The explanation: Matthias Schleiden, a German botanist and Theodore Schwann, a British zoologist together FORMULATED the cell theory. Rudolph Virchow introduced his theory of Omnis cellula-e cellula, THUS GIVING the final SHAPE to the cell theory.

Discussion

36.	Which of these structures is used in bacterial transformation?(a) Plasmid(b) Cell membrane(c) Ribosomes(d) Genomic DNAThis question was addressed to me during an interview for a job.My question comes from Prokaryotic Cells in section Cell : The Unit of Life of Biology – Class 11
Answer» Right OPTION is (a) Plasmid Easy explanation: Plasmids are made of NUCLEIC acids. They are extrachromosomal small circular DNA that is present in bacterial cell, apart from the GENOMIC DNA. They are used as vectors for bacterial TRANSFORMATION.

Discussion

37.	Which among the following is incorrect about RBCs?(a) RBCs are anucleate because this allows them contain more oxygen and therefore carry more oxygen(b) Immature RBCs do contain nucleus which lets them to reproduce but in the later stage of their life they become devoid of nucleus(c) RBCs contain all other organelles like mitochondria, Golgi apparatus and SER etc(d) Due to lack of nucleus, they don’t get involved in the protein synthesisI had been asked this question during an online interview.I would like to ask this question from Cell topic in portion Cell : The Unit of Life of Biology – Class 11
Answer» The correct CHOICE is (C) RBCs contain all other organelles like mitochondria, GOLGI apparatus and SER etc Best explanation: RBCs are anucleate because this allows them contain more oxygen and therefore carry more oxygen. RBCs are anucleate because this allows them contain more oxygen and therefore carry more oxygen. RBCs LACK mitochondria, Golgi apparatus and SER etc. Due to lack of NUCLEUS, they don’t get involved in the protein synthesis.

Discussion

38.	Which type of chromosome has its centromere at its tip?(a) Acrocentric chromosome(b) Telocentric chromosome(c) Sub – metacentric chromosome(d) Metacentric chromosomeThis question was posed to me by my school principal while I was bunking the class.My question comes from Cell in portion Cell : The Unit of Life of Biology – Class 11
Answer» Right option is (b) Telocentric chromosome Explanation: BASED on the position of the CENTROMERE, the CHROMOSOMES can be classified into four types. In telocentric chromosomes, the centromere is located at the proximal end or the TIP of the chromosome.

Discussion

39.	Which of these organelles are not membrane bound?(a) Mitochondria(b) Endoplasmic reticulum(c) Nucleolus(d) LysosomeThe question was asked in semester exam.Origin of the question is Cell topic in section Cell : The Unit of Life of Biology – Class 11
Answer» RIGHT answer is (c) Nucleolus Easy explanation: The nucleus contains the nucleolus which is not a membrane-bound organelle. The mitochondria, the ENDOPLASMIC reticulum, and lysosomes are present in the cytosol. They are membrane-bound organelles of the cell.

Discussion

40.	Which of these bacteria lack a cell wall?(a) Escherichia(b) Pseudomonas(c) Mycoplasma(d) MycobacteriumThe question was asked in an interview.This question is from Prokaryotic Cells in division Cell : The Unit of Life of Biology – Class 11
Answer» Correct choice is (c) Mycoplasma Explanation: All BACTERIA have a CELL wall covering the cell membrane, EXCEPT in the GENUS mycoplasma. Since all bacteria are prokaryotic organisms, they do not have a well – defined nucleus. The GENETIC material is naked.

Discussion

41.	Which of these structures of the phospholipid bilayer is correctly matched with its property?(a) Phosphate head – hydrophobic(b) Phosphate head – hydrophilic(c) Lipid tail – hydrophilic(d) Lipid tail – PolarThis question was addressed to me in semester exam.I need to ask this question from Eukaryotic Cells and it’s Organelles in portion Cell : The Unit of Life of Biology – Class 11
Answer» RIGHT option is (b) Phosphate HEAD – hydrophilic Easiest EXPLANATION: The cell MEMBRANE is a phospholipid bilayer in which the polar and hydrophilic phosphate head GROUPS face outwards, while the non-polar and hydrophilic lipid tails face each other.

Discussion

42.	Which of these is not a basic shape of bacteria?(a) Vibrio(b) Spirillum(c) Triangular(d) CoccusThis question was addressed to me by my school principal while I was bunking the class.Question is from Prokaryotic Cells topic in section Cell : The Unit of Life of Biology – Class 11
Answer» Correct choice is (c) Triangular To EXPLAIN: Bacteria have FOUR basic shapes. These are BACILLUS or rod – shaped, coccus or spherical shape, vibrio or comma shaped and spirillum or spiral shaped. Bacteria are a type of PROKARYOTIC ORGANISMS.

Discussion

43.	Which of these is not explained by the cell theory?(a) Source or new cells(b) The basic unit of life(c) Composition of living things(d) Formation of new cellsThis question was posed to me in exam.My question is based upon Cell Theory in section Cell : The Unit of Life of Biology – Class 11
Answer» Right choice is (d) Formation of new cells To explain I would say: Matthias Schleiden and Theodore SCHWANN together FORMULATED the CELL theory. It states that living things are COMPOSED cells, that the cell is the basic unit of life, and that new cells arise from existing cells.

Discussion

44.	The nucleolus is the site of rRNA synthesis. True or false?(a) True(b) FalseThe question was posed to me in examination.My question is from Cell topic in chapter Cell : The Unit of Life of Biology – Class 11
Answer» CORRECT answer is (a) True Explanation: The nucleus contains the nucleolus which is not a membrane-bound organelle. The nucleus also contains chromatin. The nucleolus is the SITE of ACTIVE RIBOSOMAL RNA or rRNA SYNTHESIS.

Discussion

45.	Which scientist coined the term chromatin?(a) Robert Koch(b) Louis Pasteur(c) Robert Brown(d) Alexander FlemingThis question was posed to me during an interview.This interesting question is from Cell topic in section Cell : The Unit of Life of Biology – Class 11
Answer» Right ANSWER is (d) Alexander Fleming The BEST I can explain: SIR Alexander Fleming was a Scottish scientist, KNOWN for his WORK on microbiology and medicine. The material in the nucleus which he stained by basic dyes was coined by him as chromatin.

Discussion

46.	The eukaryotic ribosome is 80S. what does this ‘S’ denote?(a) Supernatant coefficient(b) Segregation coefficient(c) Solidification coefficient(d) Sedimentation coefficientI got this question in quiz.My query is from Eukaryotic Cells and it’s Organelles topic in chapter Cell : The Unit of Life of Biology – Class 11
Answer» RIGHT ANSWER is (d) Sedimentation coefficient The explanation: The ‘S’ in 80S ribosome, or Svedberg’s Unit, stands for sedimentation coefficient. The sedimentation coefficient (S) of a PARTICLE CHARACTERIZES the rate of sedimentation during CENTRIFUGATION.

Discussion

47.	Which of these organelles possess a single circular DNA molecule?(a) Golgi apparatus(b) Peroxisome(c) Lysosome(d) MitochondriaThis question was posed to me at a job interview.Question is from Eukaryotic Cells and it’s Organelles topic in chapter Cell : The Unit of Life of Biology – Class 11
Answer» The correct answer is (d) Mitochondria The BEST explanation: Apart from the genomic DNA present inside the NUCLEUS, the mitochondria POSSESSES its own GENETIC MATERIAL in the form of a single circular DNA molecule. This DNA codes for some mitochondrial proteins.

Discussion

48.	What are the membranes of vacuoles called?(a) Tonoplast(b) Leucoplast(c) Amyloplast(d) ChromoplastI had been asked this question in an internship interview.Origin of the question is Eukaryotic Cells and it’s Organelles in portion Cell : The Unit of Life of Biology – Class 11
Answer» The correct answer is (a) Tonoplast To explain I would say: Vacuoles are covered by a SINGLE MEMBRANE KNOWN as tonoplast. Vacuoles contain SUBSTANCES for STORAGE such as water, or excretory products such as sap and other materials not useful for the cell.

Discussion

49.	Which of these is not present in a plant cell wall?(a) Pectin(b) Calcium carbonate(c) Hemicellulose(d) CelluloseI got this question in an online quiz.This is a very interesting question from Eukaryotic Cells and it’s Organelles in section Cell : The Unit of Life of Biology – Class 11
Answer» The CORRECT option is (b) Calcium carbonate Best explanation: The algal cell wall contains cellulose, galactans, mannans and minerals like calcium carbonate. HOWEVER, the PLANT cell wall contains cellulose, HEMICELLULOSE, pectins and proteins.

Discussion

50.	What is the function of plasmodesmata in plants?(a) Protecting the cells from mechanical stresses(b) Providing shape to the cells(c) Connecting the cytoplasm of adjacent cells(d) Joining two adjacent plant cell wallsThis question was addressed to me in an interview for job.This is a very interesting question from Eukaryotic Cells and it’s Organelles topic in chapter Cell : The Unit of Life of Biology – Class 11
Answer» Correct CHOICE is (c) CONNECTING the cytoplasm of adjacent cells The best explanation: The PLASMODESMATA pass through the cell wall and the middle lamella and connect the cytoplasm of the two cells. Adjacent plant cells ADHERE to each other due to the presence of the middle lamella.

Discussion

Explore topic-wise InterviewSolutions in .

Which of these is an important constituent of the nuclear matrix?(a) Chromatin(b) Ribosomes(c) Mitochondria(d) CentrosomesThis question was addressed to me in an interview for internship.My question comes from Cell in section Cell : The Unit of Life of Biology – Class 11

Which of these bacteria have chromatophores?(a) Escherichia(b) Mycobacteria(c) Mycoplasma(d) CyanobacteriaThe question was posed to me in an interview for job.Origin of the question is Prokaryotic Cells topic in section Cell : The Unit of Life of Biology – Class 11

What are plasmid made of?(a) Proteins(b) Polysaccharides(c) Nucleic acids(d) LipidsI have been asked this question in an online quiz.This intriguing question originated from Prokaryotic Cells in chapter Cell : The Unit of Life of Biology – Class 11

Theodore Schwann was a _____(a) British zoologist(b) German zoologist(c) British botanist(d) German botanistThe question was posed to me in an online interview.My query is from Cell Theory in division Cell : The Unit of Life of Biology – Class 11

What is the site of rRNA synthesis within a cell?(a) Chromatin(b) Nucleolus(c) Perinuclear space(d) CentrosomesThe question was asked in semester exam.My question is based upon Cell topic in section Cell : The Unit of Life of Biology – Class 11

Which of these structures is not a part of the bacterial flagella?(a) Filament(b) Basal Body(c) Lamina(d) HookI got this question at a job interview.This is a very interesting question from Prokaryotic Cells topic in portion Cell : The Unit of Life of Biology – Class 11

What forms the basal body of flagella?(a) Axoneme(b) Centrioles(c) Keratin(d) Calcium carbonateThis question was posed to me during an online exam.Question is taken from Eukaryotic Cells and it’s Organelles in portion Cell : The Unit of Life of Biology – Class 11

Which of these are absent in plant cell?(a) Large central vacuole(b) Cell wall(c) Centriole(d) PlastidThe question was asked in an interview.The question is from Eukaryotic Cells and it’s Organelles in division Cell : The Unit of Life of Biology – Class 11

What are the disc shaped structures located on the sides of the centromere?(a) Kinetochores(b) Satellite cells(c) Flagella(d) RibosomesI have been asked this question in my homework.This interesting question is from Cell topic in section Cell : The Unit of Life of Biology – Class 11

How many microtubules does the axoneme contain?(a) 6 + 5(b) 8 + 3(c) 9 + 2(d) 7 + 4I have been asked this question during an interview.I would like to ask this question from Eukaryotic Cells and it’s Organelles topic in section Cell : The Unit of Life of Biology – Class 11

What is the percentage of protein in the cell membrane of human erythrocytes?(a) 52%(b) 40%(c) 37%(d) 33%I got this question during an interview.I want to ask this question from Eukaryotic Cells and it’s Organelles topic in division Cell : The Unit of Life of Biology – Class 11

Gram negative bacteria take up gram strain. True or false?(a) True(b) FalseI have been asked this question during an interview.I would like to ask this question from Prokaryotic Cells topic in chapter Cell : The Unit of Life of Biology – Class 11

Who gave the final shape to the cell theory?(a) Antony Von Leeuwenhoek(b) Matthias Schleiden(c) Rudolph Virchow(d) Theodore SchwannThis question was posed to me in quiz.The question is from Cell Theory topic in section Cell : The Unit of Life of Biology – Class 11

How many layers are present in the bacterial cell envelope?(a) 1(b) 2(c) 3(d) 4This question was posed to me during an interview.My doubt stems from Prokaryotic Cells topic in division Cell : The Unit of Life of Biology – Class 11

Cells are the structural unit of life and all the organisms are made of cells.(a) True(b) FalseThe question was asked in an internship interview.I need to ask this question from Cell Basics in division Cell : The Unit of Life of Biology – Class 11

Which of these cells lack a nucleus?(a) Thrombocytes in humans(b) Lymphocytes of primates(c) Sieve tube cells of vascular plants(d) Epithelial cellsThis question was posed to me during an interview.Asked question is from Cell in portion Cell : The Unit of Life of Biology – Class 11

What is the shape of a centriole?(a) Irregular(b) Spherical(c) Cylindrical(d) CuboidalI have been asked this question at a job interview.Question is from Eukaryotic Cells and it’s Organelles in section Cell : The Unit of Life of Biology – Class 11

How many chloroplasts are present in each cell of Chlamydomonas?(a) 1(b) 2(c) 3(d) 4This question was posed to me in final exam.This is a very interesting question from Eukaryotic Cells and it’s Organelles topic in division Cell : The Unit of Life of Biology – Class 11

Which of these scientists did not contribute to the cell theory?(a) Robert Koch(b) Matthias Schleiden(c) Theodore Schwann(d) Rudolph VirchowThe question was asked in an online quiz.My query is from Cell Theory in portion Cell : The Unit of Life of Biology – Class 11

Which of these structures is used in bacterial transformation?(a) Plasmid(b) Cell membrane(c) Ribosomes(d) Genomic DNAThis question was addressed to me during an interview for a job.My question comes from Prokaryotic Cells in section Cell : The Unit of Life of Biology – Class 11

Which of these organelles are not membrane bound?(a) Mitochondria(b) Endoplasmic reticulum(c) Nucleolus(d) LysosomeThe question was asked in semester exam.Origin of the question is Cell topic in section Cell : The Unit of Life of Biology – Class 11

Which of these bacteria lack a cell wall?(a) Escherichia(b) Pseudomonas(c) Mycoplasma(d) MycobacteriumThe question was asked in an interview.This question is from Prokaryotic Cells in division Cell : The Unit of Life of Biology – Class 11

Which of these is not a basic shape of bacteria?(a) Vibrio(b) Spirillum(c) Triangular(d) CoccusThis question was addressed to me by my school principal while I was bunking the class.Question is from Prokaryotic Cells topic in section Cell : The Unit of Life of Biology – Class 11

Which of these is not explained by the cell theory?(a) Source or new cells(b) The basic unit of life(c) Composition of living things(d) Formation of new cellsThis question was posed to me in exam.My question is based upon Cell Theory in section Cell : The Unit of Life of Biology – Class 11

The nucleolus is the site of rRNA synthesis. True or false?(a) True(b) FalseThe question was posed to me in examination.My question is from Cell topic in chapter Cell : The Unit of Life of Biology – Class 11

Which scientist coined the term chromatin?(a) Robert Koch(b) Louis Pasteur(c) Robert Brown(d) Alexander FlemingThis question was posed to me during an interview.This interesting question is from Cell topic in section Cell : The Unit of Life of Biology – Class 11

Which of these organelles possess a single circular DNA molecule?(a) Golgi apparatus(b) Peroxisome(c) Lysosome(d) MitochondriaThis question was posed to me at a job interview.Question is from Eukaryotic Cells and it’s Organelles topic in chapter Cell : The Unit of Life of Biology – Class 11

What are the membranes of vacuoles called?(a) Tonoplast(b) Leucoplast(c) Amyloplast(d) ChromoplastI had been asked this question in an internship interview.Origin of the question is Eukaryotic Cells and it’s Organelles in portion Cell : The Unit of Life of Biology – Class 11

Which of these is not present in a plant cell wall?(a) Pectin(b) Calcium carbonate(c) Hemicellulose(d) CelluloseI got this question in an online quiz.This is a very interesting question from Eukaryotic Cells and it’s Organelles in section Cell : The Unit of Life of Biology – Class 11