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51.	Which organelle helps in the synthesis of lipids, chloesterol, steroids and visual pigments in epithelial cells of retina ?A. Golgi bodiesB. RERC. SERD. Mitochondria
Answer» Correct Answer - C

52.	Tarun observed a slide of white blood cells under microscope. His teacher asked him to draw the diagram. Select the diagram which should be drawn by Taeun.A. B. C. D.
Answer» Correct Answer - B

53.	A Scientist isolated the plasma membranes from some animal cells and put them in a solution of chemicals that stabilised the membranes. When she added a small amount of a salt solution, she discovered that although the stabilising solution had increased. These new proteins in the stabilising solution were probablyA. peripheral proteinsB. integral proteinsC. lipid-anchored proteinsD. trimeric G proteins.
Answer» Correct Answer - A

54.	Assertion : Rudolf Virchow modified the hypothesis of cell theory given by Schleiden and Schwann. Reason : Cell theory says that all cells arise from pre-existing cells.A. If both assertion and reason are true amnd reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.
Answer» Correct Answer - B

55.	Which of the following statements regarding sphaerosomes is not correct ?A. Abundant in the endosperm cells of oil seedsB. Bounded by a single membraneC. Take part in synthesis and storage of lipidsD. Take part in photorespiration
Answer» Correct Answer - D Sphaerosomes are small cell organells bounded by single membrane which take part in storage and synthesis of lipids. Sphaerosomes occur abundantly in the endosperm cells of oil seeds. Chloroplast, peroxisome and mitochondria take part in photorespiration.

56.	As they release hydrolase that digest old and damaged cells, the term suicide bags is aptly used by cell biologists forA. Golgi bodiesB. lysosomesC. glyoxysomesD. peroxisomes
Answer» Correct Answer - B The lysosomes may be called 'suicide bags' of the cell in view of their autolytic role, or 'disposal units' of the cell because they digest the incoming food materials and remove the foreign bodies, toxic molecules, and debris, or 'recyling centres' as they break down worn out and defective cells and cell organelles to component molecules for building new organelles and cells.

57.	Smooth endoplasmic recticulum is well developed in the cells which synthesiseA. steroidsB. proteinsC. carbohydratesD. All of these
Answer» Correct Answer - A The SER provides surface for the synthesis of lipids, including phospholipids, cholesterol, steroid hormones (sex hormones, adrenal corticoid hormones), ascorbic acid and visual pigments.

58.	Assertion : The endoplasmic reticullum which lacks ribosomes is called smooth endoplasmic reticulum (SER). Reason : SER is mainly involved in protein synthesis.A. If both assertion and reason are true amnd reason is the correct explanation of assertion.B. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is false.D. If both assertion and reason are false.
Answer» Correct Answer - C Smooth Endoplasmic Reticulum (SER) possesses smooth membranes which do not bear ribosomes. SER is responsible for synthesis of fats inside the cells of adipose tissue, formation of sphaerosomes, synthesis of glycogen as well as glycogenolysis (hydrolysis of glycogen) in liver cells, synthesis of sterols and steroid hormones as in the interstitial cells of thestis and ovary and formation of visual pigments from vitamin A in retinal cells.

59.	Which of the following statements is incorrect for centrioles ?A. Both the centrioles in centrosome lie perpendicular to each other.B. Central proteinaceous hub is missing in a centriole.C. Each centriole has an organisation like that of a cartwheel.D. Centrosome usually contains 2 cylindrical centrioles.
Answer» Correct Answer - B

60.	Which of the following statements is incorrect ?A. Mitochondria, unless specifically stained are not easily visible under the microscope.B. Physiological activity of cells determines the number of mitochondria per cell.C. Mitochondrion, a power house of cell has DNA, RNA, ribosomes and enzymes, so it can survive outside the cell.D. Mitochondria divide by fission.
Answer» Correct Answer - C

61.	Which one of the mis-matched pair ?A. Largest isolated , single cell - Egg of an ostrichB. Golgi apparatus - Discovered by AltmanC. Mitochondria - Name was given by BendaD. Lysosomes - Discovered by de Duve
Answer» Correct Answer - B Golgi apparatus was discovered by Camillo Golgi nerve cells of barn owl and cat.

62.	Select the incorrect pair.A. Cell wall - Structural supportB. Central vacuole - StorageC. Amyloplast - Starch storageD. Plasmodesmata - Protection
Answer» Correct Answer - D

63.	Which of the following is not a function of cytoskeleton in a cell ?A. Imntracellular transportB. Maintenance of cell shape and structureC. Support of the organellsD. Cell motility
Answer» (None of the options is correct): Since all options are functions of cytoskeleton, none of the options is correct. Cytoskeletal structures occur only in eukaryotic cells. They are externally minute, fibrous and tubular structures which maintain cell shape and support the organelles. They also help in intracellular transport.

64.	Amyloplasts, elaioplasts and aleuroplasts belong to ________ category of plastids.A. chloroplastsB. chromoplastsC. leucoplastsD. All of these
Answer» Correct Answer - C

65.	All plastids have essentially the same structure becauseA. they have to perform the same functionB. they are localised in the aerial parts of plantsC. one type of plastid can differentiate into another type of plastid depending upon the cell requirementsD. all plastids have to store strach, lipids and proteins.
Answer» Correct Answer - C Plastids are double membranous, semi-autonomous organelles which store and systhesise various types of organic compounds. They develop from colourless precursors proplastids. Proplastids have the ability to divide and differentiate into vatious types of plastids.

66.	Which of the following is not true for a eukaryotic cell ?A. cell wall is made up of peptidoglycans.B. It has 80S typwe of ribosome present in the cytoplasm.C. Mitochondria contain circular DNA.D. Membrane bound organelles are present.
Answer» Correct Answer - A Cell wall is made up to peptidoglycans in bacterial cell, i.e., prokaryotic cell.

67.	Plastids differ from mitochondria on the basis of which of the following features ?A. Presence of two layers of membraneB. Presence of ribosomeC. Presence of thylakodisD. Presence of DNA
Answer» Correct Answer - C Thylakoids are present in the chloroplasts (plastids) and absent in mitochondria. Hence, mitochondria cannot take part in converting light energy to chemical energy.