Biomolecules PYQs Set 2 (PDF)

Set 2 of 2 · Questions 31-56 of 56

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Mere Teacher · Previous Year Questions NEET Biology · Biomolecules · Set 2 (Q31-56)
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31. $Identify the basic amino acid from the following.$ (1) $Valine$ (2) $Tyrosine$ (3) $Glutamic Acid$ (4) $Lysine$ 32. $Which of the following is an amino acid derived hormone?$ (1) $Epinephrine$ (2) $Ecdysone$ (3) $Estradiol$ (4) $Estriol$ 33. $Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?$ (1) $Enzymes are denatured at high temperatures but in certain exceptional organisms they are effective even at temperatures 80°-90°C$ (2) $Enzymes are highly specific$ (3) $Most enzymes are proteins but some are lipids$ (4) $Enzymes require optimum pH for maximal activity$ 34. $Following are the statements with reference to 'lipids'. (i) Lipids having only single bonds are called unsaturated fatty acids. (ii) Lecithin is a phospholipid. (iii) Trihydroxy propane is glycerol. (iv) Palmitic acid has 20 carbon atoms including carboxyl carbon. (v) Arachidonic acid has 16 carbon atoms. Choose the correct answer from the options given below.$ (1) $(i) and (ii) only$ (2) $(iii) and (iv) only$ (3) $(ii) and (iii) only$ (4) $(ii) and (v) only$ 35. $A competitive inhibitor of succinic dehydrogenase is :-$ (1) $α - ketoglutarate$ (2) $Malate$ (3) $Malonate$ (4) $Oxaloacetate$ 36. $Which of the following bond is formed as a result of reaction of carboxyl group of one amino acid with amino group of other amino acid with elimination of water?$ (1) $Hydrogen Bond$ (2) $Glycosidic Bond$ (3) $Peptide Bond$ (4) $Phosphodiester Bond$ 37. $Which one of the following sets of monoseccharides forms sucrose?$ (1) $Beta-D-Glucopyranose and Alpha-D-fructofuranose$ (2) $Alpha -D-Glucopyranose and Beta -D-fructopyranose$ (3) $Alpha -D-Galactopyranose and Alpha -D-Glucopyranose$ (4) $Alpha -D-Glucopyranose and Beta -D-fructofuranose$ 38. $"Ramachandran plot" is used to confirm the structure of :-$ (1) $RNA$ (2) $Proteins$ (3) $Triacylglycerides$ (4) $DNA$ 39. $Primary proteins are also called as polypeptides because :$ (1) $They are linear chains$ (2) $They are polymers of peptide monomers$ (3) $Successive amino acids are joined by peptide bonds$ (4) $They can assume many conformations$ 40. $Consider the following statements : (A) Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group. (B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme. Select the correct option.$ (1) $Both (A) and (B) are true.$ (2) $(A) is true and (B) is false.$ (3) $Both (A) and (B) are false.$ (4) $(A) is false and (B) is true.$ 41. $Which one of the following statements is incorrect?$ (1) $In competitive inhibition, the inhibitor molecule is not chemically changed by the enzyme.$ (2) $The competitive inhibitor does not affect the rate of breakdown of the enzyme-substrate complex.$ (3) $The presence of the competitive inhibitor decreases the Km of the enzyme for the substrate.$ (4) $A competitive inhibitor reacts reversibly with the enzyme to form an enzyme- inhibitor complex$ 42. $Identify the substances having glycosidic bond and peptide bond, respectively in their structure :$ (1) $Inulin, insulin$ (2) $Chitin, Cholesterol$ (3) $Glycerol, trypsin$ (4) $Cellulose, lecithin$ 43. $An organic substance bound to an enzyme and essential for its activity is called$ (1) $Apoenzyme$ (2) $Isoenzyme$ (3) $Coenzyme$ (4) $Holoenzyme$ 44. $Given below are two statements: Statement I : Amino acids have a property of ionizable nature of -NH2 and -COOH groups, hence have different structures at different pH. Statement II : Amino acids can exist as Zwitterionic form at acidic and basic pH. In the light of the above statements, choose the most appropriate answer from the options given below:$ (1) $Both Statement I and Statement II are correct$ (2) $Both Statement I and Statement II are Incorrect$ (3) $Statement I is correct but Statement II is incorrect$ (4) $Statement I is incorrect but Statement II is correct$ 45. $Which monosaccharide does not show optical isomerism :$ (1) $Dihydroxy acetone$ (2) $Glyceraldehyde$ (3) $Erythrose$ (4) $Ribose$ 46. $For its activity, carboxypeptidase requires :-$ (1) $Niacin$ (2) $Copper$ (3) $Zinc$ (4) $Iron$ 47. $Given below are two statements : Statement - I : Cellulose is a polymeric polysaccharide. Statement - II : The building blocks of cellulose are glucose molecules. In the light of the above statements, choose the correct answer from the options given below:$ (1) $Statement - I is incorrect but Statement - II is correct$ (2) $Both Statement - I and Statement - II are correct$ (3) $Both Statement - I and Statement - II are incorrect$ (4) $Statement - I is correct but Statement - II is incorrect$ 48. $Which of the following organic compound is correctly related with its function?$ (1) $Uridine - A nucleotide that makes up RNA$ (2) $Phosphoglycerides - A component of cell membrane$ (3) $Serine - A non-protein amino acid$ (4) $GLUT-4 - Inhibits glucose transport into cells$ 49. $In the enzyme which catalyses the breakdown of: H_{2} O_{2} \to H_{2} O + O_{2} the prosthetic group is :$ (1) $Nicotinamide adenine dinucleotide$ (2) $Haem$ (3) $Zinc$ (4) $Niacin$ 50. $A dehydration reaction links two glucose molecules to produce maltose. If the formula for glucose is C_{6} H_{12} O_{6} then what is the formula for maltose?$ (1) $C_{12} H_{24} O_{12}$ (2) $C_{12} H_{22} O_{11}$ (3) $C_{12} H_{24} O_{11}$ (4) $C_{12} H_{20} O_{10}$ 51. $Which one out of A - D given below correctly represents the structural formula of the basic amino acid? Options$ (1) $A$ (2) $B$ (3) $C$ (4) $D$ 52. $Which one of the following structural formulae of two organic compounds is correctly identified along with its related function?$ (1) $B : adenine - a nucleotide that makes up nucleic acids$ (2) $A : Triglyceride - major source of energy$ (3) $B : Uracil - a component of DNA$ (4) $A : Lecithin - a component of cell membrane$ 53. $The figure given below shows the conversion of a substrate into product by an enzyme. In which one of the four options (1-4) the components of reaction labelled as A, B, C and D are identified correctly? A B C D$ (1) $Transition State Potential energy Activation energy without enzyme Activation energy with enzyme$ (2) $Potential Energy Transition state Activation energy with enzyme Activation energy without enzyme$ (3) $Activation energy with enzyme Transition state Activation energy without enzyme Potential Energy$ (4) $Potential Energy Transition state Activation energy without enzyme Activation energy with enzyme$ 54. $Identify the incorrect pair.$ (1) $Alkaloids - Codeine$ (2) $Toxin - Abrin$ (3) $Lectins - Concanavalin A$ (4) $Drugs - Ricin$ 55. $Read the following statements on lipids and find out correct set of statements: (i) Lecithin found in the plasma membrane is a glycolipid (ii) Saturated fatty acids possess one or more c = c bonds (iii) Gingely oil has lower melting point, hence remains as oil in winter (iv) Lipids are generally insoluble in water but soluble in some organic solvents (v) When fatty acid is esterified with glycerol, monoglycerides are formed Choose the correct answer from the options given below:$ (1) $(i), (iv) and (v) only$ (2) $(iii), (iv) and (v) only$ (3) $(i), (ii) and (iv) only$ (4) $(i), (ii) and (iii) only$ 56. $Concanavalin A is :$ (1) $an alkaloid$ (2) $an essential oil$ (3) $a lectin$ (4) $a pigment$