Biomolecules PYQs Set 2 (PDF)

Set 2 of 12 · Questions 31-60 of 335

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Biomolecules · Set 2 (Q31-60)
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31. $The secondary structure of protein is stabilised by:$ (1) $Peptide bond$ (2) $glycosidic bond$ (3) $Hydrogen bonding$ (4) $van der Waals forces$ 32. $Which carbon atoms (numbered from C_{1} to C_{6}) are involved in the formation of ring structure of glucose?$ (1) $C_{2} and C_{5}$ (2) $C_{1} and C_{3}$ (3) $C_{1} and C_{4}$ (4) $C_{1} and C_{5}$ 33. $Seliwanoff test and Xanthoproteic test are used for the identification of ____ and ____ respectively.$ (1) $ketoses, proteins$ (2) $proteins, ketoses$ (3) $aldoses, ketoses$ (4) $ketoses, aldoses$ 34. $Deficiency of vitamin K causes:$ (1) $Increase in blood clotting time$ (2) $Increase in fragility of RBC ’ s$ (3) $Cheilosis$ (4) $Decrease in blood clotting time$ 35. $Assertion (A): The denaturation of proteins can destroy all 1^{\circ}, 2^{\circ} and 3^{\circ} protein structures. Reason (R) : Curdling of milk is due to denaturation of proteins.The correct option among the following is$ (1) $(A) is true, (R) is true and (R) is the correct explanation for (A)$ (2) $(A) is true, (R) is true but (R) is not the correct explanation for (A)$ (3) $(A) is true but (R) is false$ (4) $(A) is false but (R) is true$ 36. $Identify the correct statement among the following:$ (1) $All naturally occurring amino acids except glycine contain one chiral center.$ (2) $Amino acid, cysteine can easily undergo dimerization due to the presence of free SH group.$ (3) $Glutamic acid is the only amino acid that contains a - COOH group at the side chain.$ (4) $All naturally occurring amino acids are optically active.$ 37. $List-I (A) Chlorophyll (I) Ruthenium (C) Anticancer drug (III) Cobalt List-II (B) Vitamin- B_{12} (II) Platinum (D) Grubbs catalyst (IV) Magnesium Choose the most appropriate answer from the options given below:$ (1) $A - III, B - II, C - IV, D - I$ (2) $A - IV, B - III), C - II, D - I$ (3) $A - IV, B - III, C - I, D - II$ (4) $A - IV, B - II, C - III, D - I$ 38. $Given below are two statements : one is labelled as Assertion (A) and other is labelled as Reason (R). Assertion (A): Sucrose is a disaccharide and a non-reducing sugar. Reason (R): Sucrose involves glycosidic linkage between C_{1} of β -glucose and C_{2} of α -fructose. Choose themost appropriate answer from the options given below :$ (1) $Both (A) and (R) are true but (R) is not the true explanation of (A)$ (2) $(A) is false but (R) is true.$ (3) $(A) is true but (R) is false$ (4) $Both (A) and (R) are true and (R) is the true explanation of (A)$ 39. $Match List-I With List - II List - I (Carbohydrate) (A) Amylose (B) Cellulose (C) Glycogen (D) Amylopectin List - II (Linkage Source) (I) β - C_{1} - C_{4}, plant (II) α -C1-C4, animal (III) α - C_{1} - C_{4}, α - C_{1} - C_{6}, plant (IV) α -C1-C4, plant Choose the correct answer from the options given below:$ (1) $(A)-(IV), (B)-(I), (C)-(III), (D)-(II)$ (2) $(A)-(III), (B)-(II), (C)-(I), (D)-(IV)$ (3) $(A)-(II), (B)-(III), (C)-(I), (D)-(IV)$ (4) $(A)-(IV), (B)-(I), (C)-(II), (D)-(III)$ 40. $Which of the following vitamins is water soluble?$ (1) $Vitamin E$ (2) $Vitamin K$ (3) $Vitamin A$ (4) $Vitamin B$ 41. $From the following, the correct statements about polysaccharides are (I) Starch is a polymer of α - D (+) -glucose (II) Amylose component of starch is not soluble in water. (III)Amylose is a branched chain polymer of α - D (+) - glucose. (IV) Cellulose is a straight chain polymer of β - D (+) - glucose units$ (1) $I & IV only$ (2) $II & III only$ (3) $II & IV only$ (4) $I & III only$ 42. $Which of the following is a thermosetting polymer ?$ (1) $Bakelite$ (2) $Buns- N$ (3) $Nylon 6$ (4) $PVC$ 43. $Which of the following hormones is produced under the conditions of stress which stimulate glycogenolysis in the liver of human beings?$ (1) $Thyroxin$ (2) $Insulin$ (3) $Adrenaline$ (4) $Estradiol$ 44. $The difference between amylose and amylopectin is$ (1) $amylopectin have 1 \to 4 α ‐linkage and 1 \to 6 α ‐linkage$ (2) $amylose have 1 \to 4 α ‐linkage and 1 \to 6 β ‐linkage$ (3) $amylopectin have 1 \to 4 α ‐linkage and 1 \to 6 β ‐linkage$ (4) $amylose is made up of glucose and galactose.$ 45. $Match List I with List II LIST-I (Substances) (A) Ziegler catalyst (B) Blood Pigment (C) Wilkinson catalyst (D) Vitamin B B12 LIST-II (Element Present) (I) Rhodium (II) Cobalt (III) Iron (IV) Titanium Choose the correct answer from the options given below:$ (1) $A-II, B-IV, C-I, D-III$ (2) $A-II, B-III, C-IV, D-I$ (3) $A-III, B-II, C-IV, D-I$ (4) $A-IV, B-III, C-I, D-II$ 46. $Which of the given statement is incorrect about glucose?$ (1) $Glucose exists in two crystalline forms α and β$ (2) $Glucose gives Schiff's test for aldehyde.$ (3) $Glucose reacts with hydroxylamine to form oxime.$ (4) $The pentaacetate of glucose does not react with hydroxylamine to give oxime.$ 47. $The non-essential amino acid among the following is [NEET 2019]$ (1) $leucine$ (2) $alanine$ (3) $lysine$ (4) $valine$ 48. $Which hormone tends to increase the blood glucose level in human?$ (1) $Insulin$ (2) $Glucagon$ (3) $Epinephrine$ (4) $Estrogen$ 49. $Which of the following are reducing sugars? I. Sucrose II. Ribose II. Lactose IV. Fructose$ (1) $I and II$ (2) $II, Ill and IV$ (3) $II and III$ (4) $I, II and IV$ 50. $Given below are two statements: Statement (I): On hydrolysis, oligo peptides give rise to fewer number of α -amino acids while proteins give rise to a large number of β -amino acids. Statement (II): Natural proteins are denatured by acids which convert the water soluble form of fibrous proteins to their water insoluble form. In the light of the above statements, choose the most appropriate answer from the options given below:$ (1) $Statement I is incorrect but Statement II is correct$ (2) $Both Statement I and Statement II are incorrect$ (3) $Both Statement I and Statement II are correct$ (4) $Statement I is correct but Statement II is incorrect$ 51. $Which of the following represents nucleoside?$ (1) (2) (3) (4) 52. $Which of the following are fibrous proteins Keratin Insulin Myosin Albumin A B C D$ (1) $A, B$ (2) $A, C$ (3) $B, D$ (4) $C, D$ 53. $Given below are two statementsAssertion (A): Hydrolysis of DNA does not form equal number of A and T; G and CReason (R): In DNA adenine forms hydrogen bonds with thymine and cytosine forms hydrogen bonds with guanineThe correct answer is$ (1) $Both A and R are correct and R is the correct explanation of A$ (2) $Both A and R are correct but R is not the correct explanation of A$ (3) $A is correct but R is incorrect$ (4) $A is incorrect but R is correct$ 54. $A molecule of stachyose contains how many carbon atoms?$ (1) $6$ (2) $12$ (3) $18$ (4) $24$ 55. $Which of the following is the sweetest sugar$ (1) $Fructose$ (2) $Glucose$ (3) $Sucrose$ (4) $Maltose$ 56. $The correct statement in respect of protein haemoglobin is that it$ (1) $functions as a catalyst for biological reactions$ (2) $maintains blood sugar level$ (3) $acts as an oxygen carrier in the blood$ (4) $forms antibodies and offers resistance to diseases.$ 57. $Which of the following proteins is globular?$ (1) $Collagen$ (2) $Albumin$ (3) $Myosin$ (4) $Fibroin$ 58. $In which of the following carbohydrates, molecular mass increases by 84 u after complete acetylation?$ (1) $Aldotriose$ (2) $Aldotetrose$ (3) $Ketotetrose$ (4) $Ketopentose$ 59. $Deficiency of which vitamin causes convulsions?$ (1) $Riboflavin$ (2) $Thiamine$ (3) $Ascorbic acid$ (4) $Pyridoxine$ 60. $Total number of tripeptides possible by mixing of valine and proline is_________$