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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 301. |
The major portion of the dry weight of plants comrises of Or Frame work elements in plants areA. Calcium, magnesium and sulphurB. Carbon,hydrogen and oxygenC. carbon,nitrogen and hydrogenD. Nitrogen, phosphorous and potassium |
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Answer» Correct Answer - B (B) Major portion of dry weight of a plant consist of element carbon, hydrogen and oxygen. |
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| 302. |
Which one of the following is the sweetest sugar or laevorotatory suger Or Inulin is a polymer ofA. FructoseB. GlucoseC. GalactoseD. Sucrose |
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Answer» Correct Answer - A (a) Fructose is the most common form of sugar. It is the sweetest among naturally occurring sugars. It has sweetening index of 170 (where as the sweetening index of glucose is 70). |
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| 303. |
Which is true about enzymes ?A. All enzymes are not proteinsB. All enzymes are vitaminsC. All enzymes are proteinsD. All proteins are enzymes |
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Answer» Correct Answer - A (A) All enzymes are not proteins, some are RNA |
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| 304. |
Enzymes enhance rate of reaction byA. Combining with productB. Forming reactant-product complexC. Changing equilibrium of reactionD. Lowering activation energy |
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Answer» Correct Answer - D (D) Enzymes enhance rate of reaction by lowering activation energy. |
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| 305. |
What are the uses of inulin? |
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Answer» (i) It is a storage polysaccharide in roots of Dahlia and related plants. (ii) it is used in testing kidney function. |
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| 306. |
Adenosine monophosphate is aA. Nucleoside of DNAB. Nucleotide of DNAC. Nucleoside of RNAD. Nucleotide of RNA. |
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Answer» Correct Answer - D (D) Adenosine monophosphate is a nucleotide of RNA. |
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| 307. |
What do you understand by secondary structured of protein? Explain. |
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Answer» Secondary structure is a three-dimensional form of a polypeptide chain Many secondary structure in possess two forms i.e. α -helix and β-pleated secondary structure. |
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| 308. |
List any four salient features of Watson-Crick model of DNA. |
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Answer» Four salient features of Watson and Crick model are: (i) DNA molecule consist of two polynucleotide chains, which are coiled like a rope in helical fashion. So the two strands form a double helix’. (ii) The two strands of a Polynucleotides are antiparallel i.e., run in the opposite direction. The backbone is formed by the sugar-phosphate-sugar chain with the nitrogenous bases projected inside. (iii) Each DNA helix has alternate minor and major groove having width of 12 Å and 22 Å respectively. (iv) The distance between two consecutive spirals is 34 Å Thus, between two consecutive spirals, 10 nucleotides can be adjusted. |
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| 309. |
The Watson-Crick model of DNA exhibits…………….. Of DNAA. Primary structureB. Secondary structureC. Tertiary structureD. Quaternary structure |
| Answer» Correct Answer - B | |
| 310. |
Which is the left – handed DNA? (a) B – DNA (b) A – DNA (c) Z – DNA (d) dsDNA |
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Answer» Correct Answer is: (c) Z – DNA |
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| 311. |
In DNA model of Watson & Crick, the major grooves are site ofA. binding of histone proteinsB. binding of acidic proteinsC. binding of RNA moleculesD. binding of glycoproteins |
| Answer» Correct Answer - B | |
| 312. |
Which of the following is not a pyrimidineA. ThymineB. UracilC. GuanineD. Cytosine |
| Answer» Correct Answer - C | |
| 313. |
Which type of DNA was described by Watson & Crick? (a) Z – DNA (b) α – DNA (c) B – DNA (d) A – DNA |
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Answer» Correct Answer is : (c) B – DNA |
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| 314. |
Which of the following is not a pyrimidine base?A. CytosineB. ThymineC. UracilD. Guanine |
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Answer» Correct Answer - D Guanine is a purine base. The heterocyclic base obtained for nucleosides are capable of existing in more than one tautomeric form. The forms that are shown in the `NCERT` text book are the predominant forms that the base assumes when they are present in nucleic acids. |
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| 315. |
Which is not a pyrimidine base? (a) Cytosine (b) Uracil (c) Guanine (d) Thymine |
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Answer» Correct Answer is : (c) Guanine |
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| 316. |
Select the incorrect statement from the following.A. Prosthetic groups are inorganic compounds which tightly bind with the apoenzyme.B. Coenzymes are organic compounds but their association with apoenzyme is only transient.C. Coenzymes serve as co-factors in number of enzyme catalysed reactions.D. All of these |
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Answer» Correct Answer - A Prosthetic groups are organic compounds which are tightly bound to the apoenzyme. |
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| 317. |
…………… protects the end of the chromosomes from damage. (a) Satellite (b) Kinetochore (c) Primary constriction (d) Telomere |
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Answer» Correct Answer is : (d) Telomere |
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| 318. |
Sometimes the starting codon is GUG in place of AUG. GUG normally stands forA. ValineB. GlyycineC. MeltionineD. Tyrosine |
| Answer» Correct Answer - A | |
| 319. |
Read the following statements and find out the incorrect statement.A. Glycogen is a branched polymer of glucoseB. Cellulose does not contain complex helices and hence cannot gives Iodine test.C. Paper made from plant pulp is cellulosic.D. Chitin is heteropolymer. |
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Answer» Correct Answer - D (D) Glycogen is brnaced polymer of glucose. Cellulose doesn not contain complex helices and hence cannot give Iodine test. Paper made from plant pulp is cellulosic. Chitin is homopolymer of N- acetyl glycosamine. |
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| 320. |
…………… is a catalytic RNA. (a) mRNA (b) Ribozyme (c) Ribonuclease (d) rRNA |
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Answer» Correct Answer is : (b) Ribozyme |
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| 321. |
Co-enzyme nicotinamide adenine dinucleotide (NAD) contains vitaminA. thiamineB. niacinC. riboflavinD. none of these. |
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Answer» Correct Answer - B Most of the co-enzyme are made up of water soluble vitamins (B and C), e.g., thiamine, nicotinamide, etc. Co-enzyme NAD and NADP contain niacin vitamin. |
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| 322. |
Flavin adenine dinucleotide contains …………… which helps to accept hydrogen. (a) ascolac acid (b) cyanocobalamin (c) riboflavin (d) keratinine |
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Answer» (c) riboflavin |
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| 323. |
DNA which is composed of dinucleotide unit isA. A-DNAB. B-DNAC. C-DNAD. Z-DNA |
| Answer» Correct Answer - B | |
| 324. |
What are macromolecules ? Give examples. |
| Answer» Macromolecules are large, high molecular weight substances with complex molecular structure and occur in colloidal state (being insolible) in intracellular flind. They are formed by polymerization of large number of micromolecules. Example are polysaccharides, proteins and nucleic acids. | |
| 325. |
Whay is the product obtained when glycine hydrochloride reacts with two equivalents of `NaOH` ? Write the chemical reactions involved. |
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Answer» Correct Answer - `Cl^(Theta)H_(3)overset(oplus)(N)-underset(underset(underset("glycinehydrochloride")(O))(||))(CH_(2))-C-OH + underset("1st eqv.")(NaOH) rarr overset(oplus)(N)H_(2)CH_(2) overset(overset(O)(||))(C)O^(Theta)+H_(2)+NaCl` `overset(oplus)(NH_(3))CH_(3) underset(underset(O)(||))(C)-O^(Theta)+ underset("2nd eqv.")(NaOH) rarr H_(2)N-CH_(2)-overset(overset(O)(||))(C)-O^(Theta) Na^(oplus)+H_(2)O`. `Cl^(Theta)H_(3)overset(oplus)(N)-underset(underset(underset("glycinehydrochloride")(O))(||))(CH_(2))-C-OH + underset("1st eqv.")(NaOH) rarr overset(oplus)(N)H_(2)CH_(2) overset(overset(O)(||))(C)O^(Theta)+H_(2)+NaCl` `overset(oplus)(NH_(3))CH_(3) underset(underset(O)(||))(C)-O^(Theta)+ underset("2nd eqv.")(NaOH) rarr H_(2)N-CH_(2)-overset(overset(O)(||))(C)-O^(Theta) Na^(oplus)+H_(2)O`. |
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| 326. |
Select correct statement about product `p_(1)` ?A. It gives yellow ppt. with `NaOH//I_(2)`B. It eill rep[lace maximum 3 `alpha` H atoms when placed in `D^(o+)//D_(2)O`solution for longer time.C. It will give 2,4-DNP test.D. It will give n-pentene when reduced with Zn-Hg / HCl. |
| Answer» Correct Answer - a | |
| 327. |
Which of the following statement is not correct about `P_(2)` ?A. It will give non-resolvable product with MeMgBrB. It can not give effervescence of `CO_(2)` with `NaHCO_(3)`C. It gives alkane on sodalime decarboxylationD. It can change blue litmus into red |
| Answer» Correct Answer - b | |
| 328. |
Oval shaped and eccentric starch particles are found inA. WheatB. MaizeC. PotatoD. Rice |
| Answer» Correct Answer - C | |
| 329. |
Pick up the incorrrect statement from the following.A. Glucose exists in two different crystalline forms , `alpha-`D-glucose and `beta-D`- glucoseB. Cyclic structure of `alpha-D-` glucose and `beta-`D-glucose is called pyranose structure.C. `alpha-`D-glucose and `beta-`D-glucose are enantiomers.D. Cellulose is a straight chain polysaccharide made up of only `beta`-glucose units. |
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Answer» Correct Answer - C `alpha`-D-glucose are anomers not the enantiomers. |
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| 330. |
High cholesterol patients are advised to useA. Ghee, butter and oilsB. Groundnut oil, margarine and vagetable oilsC. Fatty oil and butterD. Cheese dalda and ghee |
| Answer» Correct Answer - B | |
| 331. |
What is nucleotide? |
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Answer» Nucleotide is a unit which consists of a sugar, phosphate and a base. Nucleotides are basic units of nucleic acids. |
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| 332. |
Mention the examples of simple proteins and write their significance. |
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Answer» Examples of simple proteins are: E.g.: Albumins and histones. Significance: 1. Albumin: a. % It is the main protein in the blood. b. It maintains the pressure in the blood vessels. c. It helps in transportation of substances like hormone and drugs in the body. 2. Histones: a. It is the chief protein of chromatin. b. They are involved in packaging of DNA into structural units called nucleosomes. |
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| 333. |
DNA is not present in one of the followingA. MitochondriaB. ChloroplastC. BacteriophageD. Tobacco mosaic virus |
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Answer» Correct Answer - D (d) Because plant viruses have RNA as genetic material. |
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| 334. |
Which factor(s) affects the enzymatic activity ?A. Temperature and pHB. Change in substrate concentrationC. Binding of specific chemicals that regulates its acitivityD. All of the above |
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Answer» Correct Answer - D (D) The factors affecting the enzymatic activity are temperature, pH, change in substrate concentration and binding of specific chemicals that regulates its activity. |
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| 335. |
Taste receptor, smell receptor and hormone receptor are made up ofA. ProteinB. CarbohydratesC. LipidsD. Nucleic acids |
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Answer» Correct Answer - A (A) Taste receptor, smell receptor and hormone receptor are made up of proteins. |
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| 336. |
Principle organic constituent of a living being in order of relative abundance isA. WaterB. ProteinC. LipidD. DNA |
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Answer» Correct Answer - B (B) Principle organic constituent of a living being in order of relative abundance is protein |
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| 337. |
Which of the following graphs shows the relationship between the rate of an enzymatic activity and substrate concentration (S) ?A. B. C. D. |
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Answer» Correct Answer - D Increase in substrate concentration increases the rate of reaction due to two factors: (i) occupation of more and more active sites by the substrate molecules, (ii) higher number of collisions between substrate molecules. The rise in velocity is quite high in the beginning but it decreases progressively with the increase in substate concentration. If a graph is plotted for substrate concentration versus reaction velocity, it appears as a hyperbolic curve. A stage is reached where velocity is maximum. It does not increase further by increasing the substrate concentration. At this stage the anzyme molecule becomes fully saturated and no active site is left free to bind additional substrate molecules. |
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| 338. |
The proteinaceous molecule that joins a non-protein prosthetic group to form a functional enzyme, is calledA. apoenzymeB. co-factorC. holoenzymeD. isoenzyme. |
| Answer» Correct Answer - A | |
| 339. |
When a compound ‘x’ is added to a chemical solution containing enzyme and substrate, the enzymatic activity stops. What could be the nature of compound ‘x’? |
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Answer» Compound ‘x’ could be either competitive or non-competitive inhibitor. |
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| 340. |
How are enzymes categorised? |
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Answer» On basis of chemical composition enzymes are categorised: 1. Purely proteinaceous enzymes: e.g. Proteases that spilt protein 2. Conjugated enzymes: enzymes are made up of a protein to which a non-protein prosthetic group is attached. |
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| 341. |
What is a prosthetic group ? What w ill happen if it is removed? |
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Answer» 1. Prosthetic group is non-protein in nature and is attached to the protein component of enzyme by chemical bonds. 2. It is not removed by hydrolysis. 3. If the prosthetic group is removed the protein part of the enzyme becomes inactive. |
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| 342. |
What are co-factors? |
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Answer» 1. Enzymes require certain inorganic ions for their activity. 2. The inorganic ions which are loosely attached to the protein part are called cofactors. E.g. Magnesium, copper, zinc, iron, manganese etc. [Note: Apoenzyme (protein part) and cofactor together form a complete catalytically active enzyme which is known as holoenzyme. The co-factors are of two types; metal ions and coenzymes. A coenzyme or metal ion that is very tightly or even covalently bound to the enzyme protein is known as a prosthetic group.] |
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| 343. |
What are coenzymes? |
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Answer» 1. Enzymes require certain organic compounds for their activity. 2. The organic compounds that are tightly attached to the protein part are called coenzymes. 3. E.g. Nicotinamaide adenine dinucleotide (NAD), Flavin mononucleotide (FMN). |
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| 344. |
Give examples of coenzymes and cofactors. |
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Answer» 1. Nicotinamaide adenine dinucleotide (NAD), Flavin mononucleotide (FMN). 2. Magnesium, copper, zinc, iron, manganese etc. |
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| 345. |
Subunits present in haemoglobin are:A. 3B. 4C. 5D. 2 |
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Answer» Correct Answer - C One molecule of haemoglobin has 4 haeme groups, and each of them is capable of taking up one molecule of `O_(2)`, therefore, oxyhaemoglobin may be depicted as `Hb(O_(2))_(4)`. |
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| 346. |
Statement I: All enzymes are protiens but all proteins are not enzymes. Statement II: Enzymes are biocatalysts and have stable configuration having an active site.A. Statement `I` is true, Statement `II` is true, Statements `II` is the correct explanation of Statement `I`.B. Statement `I` is true, Statement `II` is true, Statement `II` is not the correct explanation of Statement `I`.C. Statement `I` is true, Statement `II` is false.D. Statement `I` is false, Statement `II` is true. |
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Answer» Correct Answer - A Both the statements are correct and statement `II` is the correct explantion of Statement `I`. |
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| 347. |
`ATP` is the main source of energy of many anaerobic realations. Statement II: Anaerobic reactions occur in the presence of oxygen.A. Statement `I` is true, Statement `II` is true, Statements `II` is the correct explanation of Statement `I`.B. Statement `I` is true, Statement `II` is true, Statement `II` is not the correct explanation of Statement `I`.C. Statement `I` is true, Statement `II` is false.D. Statement `I` is false, Statement `II` is true. |
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Answer» Correct Answer - C Statement `I` is correct, but statement `II` is wrong because anaerobic reaction occures in the absence of oxygen. |
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| 348. |
Which enzyme dissolves blood clots in the coronary artery? |
| Answer» Correct Answer - Streptokinase. | |
| 349. |
Cyanide kills animlas by inhibiting cytochrome oxidase (an enzyme of respiration) by binding irreversibly with copper. It does not bind with active site. This is an example ofA. competitive inhinitionB. non competitive inhibitionC. feed back inhibitionD. all of the above |
| Answer» Correct Answer - B | |
| 350. |
Cyanide kills an animal byA. Killing the brain cellsB. Conpetitive inhibitor of enzyme cytochrome oxidiseC. Inhibiting cytochrome oxidase, a mitochondrial enzyme essential for cellular respriation by Non-competitive inhibitionD. Killing the cells of cardiac muscles |
| Answer» Correct Answer - C | |