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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.
| 1101. |
Agar agar is obtained fromA. Red algaeB. Blue-green algaeC. Brown algaeD. Green algae |
| Answer» Correct Answer - A | |
| 1102. |
Choose Correct statements about proteinsA. Primary structure of proteins refer to amino acid sequenceB. Interaction between three polypeptide chains give rise to tertiary structure of proteinsC. Association between four polypeptide chains give quaternary structure of proteinsD. Folding of polypeptide chain due to interaction between carbonyl group and `-overset(|)N-H` group of peptide linkage give rise to secondry structure |
| Answer» Correct Answer - A::D | |
| 1103. |
The catalytic effeiciency of two different enzymes can be compared by theA. formation of the productB. the pH of optimium valueC. the Km valueD. moleculae size of the enzyme |
| Answer» Correct Answer - C | |
| 1104. |
Denaturation of protein can be brought about byA. Changing concentrationB. Changing pHC. Changing TemperatureD. Changing amino acid sequence |
| Answer» Correct Answer - B::C | |
| 1105. |
Explain the catalytic action of enzymes. |
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Answer» Mechanism of enzyme catalysis : Action of an enzyme on a substrate is known as lock-and key mechanism. Accordingly, The enzyme has active site on its surface. A substrate molecule can attach to this active site only if it has the right size and shape. Once in the active site, the substrate is held in the correct orientation, enzymes provide functional group which will attack the substrate and forms the products of reaction. The products leave the active site and the enzyme is ready to act as catalyst again. |
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| 1106. |
When protein is subjected to denaturationA. It is hydrolysed to constituent amino acidsB. Electric field has no influence on its migrationC. Constituent amino acids are separatedD. It uncoils from an ordered and specific conformation into a more random conformation and precipitates from solution |
| Answer» Correct Answer - D | |
| 1107. |
Define : Enzymes |
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Answer» All biological reactions are catalysed by bio-catalyst in living organisms called enzymes. |
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| 1108. |
Insulin isA. Polymer of `alpha`-amino acidB. Monomer of `alpha`-amino acidC. Polymer of `beta`-amino acidD. Monomer of `beta`-amino acid |
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Answer» Correct Answer - A |
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| 1109. |
Enzymes areA. carbohydratesB. lipidsC. fatsD. polypeptides |
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Answer» Correct Answer - D |
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| 1110. |
What is denaturation of proteins? How is denaturation brought about?OR What is the effect of denaturation on the structure of proteins? |
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Answer» The press by which the molecular shape of protein changes without breaking the amide / peptide bonds that form the primary structure is called denaturation. OR Proteins gets easily precipitated. It is an irreversible change and the prαess is called denaturation of proteins. Denaturation uncoils the protein and destroys the shape and thus loses their characteristic biological activity. Denaturation is brought about by heating the protein with alcohol, concentrated inorganic acids or by salts of heavy metals. During denaturation secondary and tertiary and quternary structures are destroyed but primary structure remains intact. Example : Boiling of egg to coagulate egg white, conversion of milk to curd. |
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| 1111. |
Which catalyzed biological reactionA. hormonesB. enzymesC. GlycogeneD. fats |
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Answer» Correct Answer - B |
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| 1112. |
Match the list, and select correct answer from given codes A. 1 - A, 2 - B, 3 - C, 4 - DB. 1 - D, 2 - B, 3 - A, 4 - CC. 1 - B, 2 - D, 3 - A, 4 - CD. 1 - D, 2 - C, 3 - B, 4 - A |
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Answer» Correct Answer - D |
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| 1113. |
The amino acid which has a nonpolar side chain isA. isoleusineB. aspartic acidC. serineD. lysine |
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Answer» Correct Answer - A |
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| 1114. |
The amino acid essential in man isA. SerineB. CreatinineC. PhenylalanineD. Aspartic acid |
| Answer» Correct Answer - C | |
| 1115. |
Of the following, which one is a micronutrient ?A. CaB. NC. MgD. Mn |
| Answer» Correct Answer - D | |
| 1116. |
DNA and RNA are similar in that bothA. Have same pyrimidinesB. Have thymidine basesC. Have same sugarsD. Are nucleotide polymers |
| Answer» Correct Answer - D | |
| 1117. |
What type of linkages hold together monomers in DNA? |
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Answer» Monomers in DNA are linked by phosphate linkages. |
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| 1118. |
a – D (+) Glucose and ß – D (+) glucose are ……… (a) Epimers (b) Anomers (c) Enantiomers (d) Conformational isomer |
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Answer» a – D (+) Glucose and ß – D (+) glucose are Anomers |
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| 1119. |
Which of the following are epimers? (a) D(+) – Glucose and D(+) – Galactose (b) D(+) – Glucose and D(+) – Mannose (c) Neither (a) nor (b) (d) Both (a) and (b) |
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Answer» (d) Both (a) and (b) |
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| 1120. |
Why? Chalk powder is added after complete hydrolysis of starchA. to solidify glucoseB. to remove `CaSO_4`C. to neutralise `H_2SO_4`D. to crystalise starch |
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Answer» Correct Answer - C |
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| 1121. |
Common table sugar is a disachharide ofA. glucose and fructoseB. glucose and galactoseC. fructose and galactoseD. maltose and lactose |
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Answer» Correct Answer - A |
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| 1122. |
Which of the following amino acids are achiral? (a) Alanine (b) Leucine (c) Proline (d) Glycine |
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Answer» Alanine amino acids are achiral |
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| 1123. |
Which of the following amino acids is achiral ?A. AlanineB. prolineC. ValinD. glycine |
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Answer» Correct Answer - D |
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| 1124. |
Among the following the achiral amino acid is ………….(a) 2 – ethylalanine (b) 2 – methyiglycine (c) 2 – hydroxymethyiscrine (d) Tryptophan |
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Answer» (c) 2 – hydroxymethylserine |
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| 1125. |
In a protein, various amino acids liked together by ………(a) Peptide bond(b) Dative bond (c) α – Glycosidic bond (d) β – Glycosidic bond |
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Answer» (a) Peptide bond |
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| 1126. |
The central dogma of molecular genetics states that the genetic information flows fromA. amino acids `to ` proteins `to `DNAB. DNA `to ` carbohydrates `to ` proteinsC. DNA ` to ` RNA `to ` proteinsD. `DNA to RNA to` carbohydrates |
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Answer» Correct Answer - C The central dogma of molecular genetics states that DNA `overset("Transcription")toRNAoverst("Translation")to` protein Thus, option (c) is correct |
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| 1127. |
The central dogma of molecular genetics states that the genetic information flows from ………(a) Amino acids Protein DNA (b) DNA Carbohydrates Proteins (c) DNA RNA Prnteins (d) DNA RNA Carbohydrates |
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Answer» (c) DNA RNA Proteins |
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| 1128. |
In sickle cell anaemia, the basis of malfunction of haemoglobin molecules isA. reduced affinity for oxygenB. incorrect secondary structureC. substitution of glutamic acid residue by valineD. faulty binding of the heme group |
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Answer» Correct Answer - C The genetically based disease sickle - cell anemia results from a single amino acid error in the `beta`-chain of haemoglobin. In normal haemoglobin, position 6 has a glutamic acid residue, whereas in sickle - cell haemoglobin position 6 is occupied by valine. Red blood cells (erythrocytes) containing haemoglobin with this amino acid residue error tend to become crescent shaped ("sickle") when the partial pressure of oxygen is low, as it is in venous blood. These distorted cells are more difficult for the heart to pump through small capillaries. They may even block capillaries by clumping together, at other times the red cells may even split open. Children who inherit genetic trait from their parents suffer from a severe form of the disease and usually do not live past the age of two. |
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| 1129. |
Assertion : With the increase in substrate concentration, the velocity of the enzymatic reaction rise at first. The reaction ultimately reaches a maximum velocity which is not exceeded by any further rise in concentration of the substrate. Reason : The enzyme molecules are fewer than substrate molecules and after saturation of thes molecules, there are no free enzymes to bind with the additional substrate molecules.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true and the reason is not the correct explanation of the assertionC. If assertion is true but reason is falseD. If both assertion and reason are false |
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Answer» Correct Answer - A (A) with the increases substrate concentration, the velocity of the enzymatic reactions rises at first. The reaction ultimately reaches a maximum velocity which is not exceeded by any further rise in concentration of the substrate because the enzyme molecule is fewer than substrate molecules and after saturation of these molecules, there are no free enzymes to bind with the additional substrate molecules. |
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| 1130. |
Amino acid alanine isA. Monoamino monocarboxylic amino acidB. Sulphur containing amino acidC. Monoamino dicarboxylic amino acidD. Basic amino acid |
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Answer» Correct Answer - A (A) Amino acid alanine is monoamino monocarboxylic amino acid. |
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| 1131. |
Select the wrong statement:A. Majority of enzymes contains a non-protein part called prosthetic groupB. Thylakoids are arranged one above the other like stack of coins forming a granum.C. Building block of lipid are amino acids.D. Crossing-over occurs at pachytene stage of meiosis I. |
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Answer» Correct Answer - C (C) Majority of enzymes contain a non-protein part called prosthtic group. Thylakoids are arranged one above the other like stack of coins forming a granum. Building blocks of proton are amino acids. Crossing-over occurs at pachytene stage of meiosis I. |
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| 1132. |
Which is not a pyrimidine?A. GuanineB. ThymineC. UracilD. Cytosine |
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Answer» Correct Answer - A (A) Guanine and adenin are not pyramidine, these are purine. |
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| 1133. |
Which of the following statements is not correct regarding chitin ?A. It is a storage polysaccharide.B. It is a homopolysaccharide.C. It is a constituent of arthropod exoskeleton and fungal cell wall.D. It is the second most abundant carbohydrate on earth. |
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Answer» Correct Answer - A Chitin is the second most abundant polysaccharide (after cellulose). Chitin is not a storage polysaccharide rather it is a structural homopolysaccharide, which forms the structural component of fungal walls and exoskeleton of arthropods. It is an unbranched polysaccharide formed of N-acetylglucosamine (NAG) monomers joined together by `beta-1, 4` linkages. |
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| 1134. |
Which of the following is an incorrect match ?A. Purines - Adenine, guanineB. Pyrimidines - Cytosine, thymineC. Structural polysaccharides - InulinD. Storage polysaccharides - Starch |
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Answer» Correct Answer - C Inulin is a fructan storage polysaccharide of roots and tubers of Dahlia and related plants. Inulin is hot metabolised in human body and is readily filtered through the kidney. It is, therefore, used in testing of kidney function, especially glomerular filtration. |
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| 1135. |
Which one is a glucose ?A. `C_(3)H_(6)O_(3)`B. `C_(6)H_(12)O_(5)`C. `C_(6)H_(12)O_(6)`D. `C_(6)H_(10)O_(6)` |
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Answer» Correct Answer - C (C) `C_(6)H_(12)O_(6)` is glucose |
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| 1136. |
`H_(2)N-underset(R)underset(|)overset(H)overset(|)( C)-COOH` is general formula of amino acid. Here R stand forA. An amino acidB. A carboxylic groupC. A variable groupD. A hydroxyl group |
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Answer» Correct Answer - C (C) R stand for variable group. |
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| 1137. |
B-DNA which is right -handed double helix contains ______ base pairs per turn of the helix and each tum is _____ long .A. 10, 3.4 ÅB. 10, 34 ÅC. 11, 20 ÅD. 11, 34 Å |
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Answer» Correct Answer - B In B-DNA, one turn of the helix has about `10` nucleotides on each strand of DNA. A turn occupies a distance of about `3.4` nm (`34 Å` or `3.4 xx10^(-9)m`) so that adjacent nucleotides or their bases are separated by a space of about `0.34 nm (0.34xx10^(-9)m or 3.4 Å)`. |
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| 1138. |
Which of the following statement is true for proteins?A. They act as antibodiesB. They act as hormonesC. They catalyze the biochemical reactionD. all of these |
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Answer» Correct Answer - D |
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| 1139. |
The plant proteinases or endopeptidases enzyme isA. UreaseB. PapainC. PepsinD. Trypsin |
| Answer» Correct Answer - B | |
| 1140. |
The two chemical reactions are showing in the following figure. Which statement is correct for reaction 1 A. Slower and more exergonic than 2B. Slower and more endergonic than 2C. Faster and more exergonic than 2D. Faster and more endergonic than 2 |
| Answer» Correct Answer - A | |
| 1141. |
Fat is hydrolysed by enzyme lipase to yieldA. Fatty acid and amino acidsB. Gycerol and fatty acidsC. Glycerine and waterD. Glycerol and amino acids |
| Answer» Correct Answer - B | |
| 1142. |
Lipase acting of fats breaksA. ester bondB. peptide bondC. hydrogen bondsD. glyosidic bond |
| Answer» Correct Answer - A | |
| 1143. |
Give alternative names for mRNA. |
| Answer» Information RNA, template RNA and heterogeneous nuclear RNA (hnRNA). | |
| 1144. |
The cofactor for the enzyme carboxypeptidase isA. CopperB. IronC. ZincD. Manganese |
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Answer» Correct Answer - C (C) The cofactor for the enzyme carboxypeptidase is Zinc. |
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| 1145. |
Zinc is a co-factor for proteolytic enzyme ______.A. carboxypeptidaseB. isocitrateC. fumaraseD. all of these |
| Answer» Correct Answer - A | |
| 1146. |
Which of the following is a cofactor for the proteolytic enzyme carboxpeptidase?A. ZincB. CopperC. CalciumD. Magnesium |
| Answer» Correct Answer - A | |
| 1147. |
Coenzyme is a part of enzymeA. inorganic metal activatorB. nonprotein organic part attached firmlyC. nonprotein orgainc part attached losselyD. vitamin A |
| Answer» Correct Answer - C | |
| 1148. |
What is the enzyme that works only in the presence of a cofactor or coenzyme called ? |
| Answer» Correct Answer - Apoenzyme. | |
| 1149. |
Which is not true about coenzyme and prothetic group ?A. Both are required for enzyme actionB. Both are seperated from enzymeC. Both are organic compoundsD. Both are not polypeptides |
| Answer» Correct Answer - B | |
| 1150. |
Coenzyme isA. always a proteinB. often a vitaminC. hydrolesesD. often a metal |
| Answer» Correct Answer - B | |