NEET CHEMISTRY ONLINE TEST | TOPIC : BIOMOLECULES QB-1

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NEET CHEMISTRY ONLINE TEST | TOPIC : BIOMOLECULES QB-1

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It contains 70 important questions. Choose the most correct answer. Then check your answer. Try again if there are errors. Regards : www.onlinetest.kalvisolai.com

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1 ➤ 1. The most important energy carrier in the living cells is

(a) UDP (b) ADP (c) ATP (d) AMP

2 ➤ 2. The pyrimidine bases present in DNA are

(a) Cytosine and adenine (b) Cytosine and guanine (c) Cytosine and thymine (d) Cytosine and uracil

3 ➤ 3. Which one of the following is a non-reducing sugar?

(a) Glucose (b) Sucrose (c) Fructose (d) Arabinose

4 ➤ 4. Which of the following is a polysaccharide?

(a) Gentiobiose (b) Fructose (c) Dextrin (d) All of these

5 ➤ 5. Which of the following reagents cannot distinguish between glucose and fructose?

(a) Tollen’s reagent (b) Fehling’s solution (c) Benedict’s solution (d) All of these

6 ➤ 6. Reducing property of monosaccharides is due to the presence of

(a) Keto group (b) Acetal group (c) Anomeric hydroxyl group (d) –CHO group

7 ➤ 7. Glucose gives silver mirror test with Tollen’s reagent. It shows the presence of

(a) Ketonic group (b) Aldehydic group (c) Alcoholic group (d) Acidic group

8 ➤ 8. Which one of the following carbohydrates will show mutarotation?

(a) Maltose (b) Sucrose (c) Starch (d) Cellulose

9 ➤ 9. Which of the following is an amphoteric acid?

(a) Glycine (b) Salicylic acid (c) Benzoic acid (d) Citric acid

10 ➤ 10. The aldehyde which is formed during photosynthesis of plants is

(a) Propanal (b) Methanal (c) Acetaldehyde (d) Phenylmethanal

11 ➤ 11. Which one of the following on reduction with NaBH4 gives an equimolar mixture of sorbitol and mannitol?

(a) Mannose (b) Glucose (c) Xylose (d) Fructose

12 ➤ 12. Which of the following compounds will not show mutarotation?

(a) β-D (+) glucopyranose (b) α-D (+) glucospyranose (c) β-D (+) galactopyranose (d) methyl-α-D-glucopyranoiside

13 ➤ 13. The conversion of maltose to glucose is possible by the enzyme

(a) Zymase (b) Lactase (c) Maltase (d) Diastase

14 ➤ 14. Oxidation of fructose with bromine water gives

(a) Gluconic acid (b) Oxalic acid (c) Trimethyl glutaric acid (d) Tartaric acid

15 ➤ 15. Which of the following is known as leavulose sugar?

(a) Glucose (b) Fructose (c) Surcose (d) Arabinose

16 ➤ 16. Which enzyme converts glucose to ethanol?

(a) Diesterase (b) Invertase (c) Zymase (d) Both (b) And (c)

17 ➤ 17. Cellulose is a polymer of

(a) Glucose (b) Fructose (c) Ribose (d) Sucrose

18 ➤ 18. Basic solution of fructose contains

(a) Only glucose (b) Only fructose (c) Glucose, fructose and mannose (d) Glucose and fructose

19 ➤ 19. An alteration in the base sequence of nucleic acid molecule is

(a) Dislocation (b) Replication (c) Duplication (d) Mutation

20 ➤ 20. Fructose is ketose sugar, even then it gives red precipitate with Fehling solution because

(a) Keto sugars undergo transformation into aldose sugars in the presence of Fehling’s solution (b) Ketones are oxidized by Fehling solution (c) Both (a) And (b) (d) None of these

21 ➤ 21. Iodine test is shown by

(a) Starch (b) Glycogen (c) Polypeptides (d) Glucose

22 ➤ 22. The term anomers of glucose refers to

(a) Isomers of glucose that differ in configurations at carbons one and four (C-1 and C-4) (b) A mixture of (d)-glucose and (L)-glucose (c) Enantiomers of glucose (d) Isomers of glucose that differ in configuration at carbon one (C-1)

23 ➤ 23. Insulin production and its action in human body is responsible for the level of diabetes. This compound belongs to which of the following categories?

(a) An enzyme (b) An antibiotic (c) A hormone (d) A co-enzyme

24 ➤ 24. Glucose reacts with acetic anhydride to form

(a) Hexa acetate (b) Penta acetate (c) Tri acetate (d) Mono acetate

25 ➤ 25. Carbohydrates are stored in human body as the polysaccharide

(a) Glycogen (b) Glucose (c) Starch (d) Galactase

26 ➤ 26. α- and β-glucose differ in the orientation of –OH group around

(a) C1 (b) C2 (c) C3 (d) C4

27 ➤ 27. Reduction product of glucose is

(a) Menthol (b) Sorbitol (c) Mannitol (d) Sorbitol and mannitol

28 ➤ 28. Table sugar is

(a) D-glucose (b) A disaccharide consisting of D-glucose and D-fructose (c) A monosaccharide (d) A disaccharide of D-glucose

29 ➤ 29. In which disaccharide glucosidic linkage is formed between anomeric –OH of glucose and anomeric–OH of fructose?

(a) Lactose (b) Maltose (c) Cellobiose (d) Sucrose

30 ➤ 30. An example of a sulphur containing amino acid is

(a) Lysine (b) Serine (c) Cysteine (d) Tyrosine

31 ➤ 31. Rapid interconversion of α-D-glucose and β-D-glucose in solution is known as:

(a) Mutarotation (b) Racemization (c) Structural isomerisation (d) Asymmetric induction

32 ➤ 32. Water insoluble component of starch is:

(a) Amylopectin (b) Amylose (c) Cellulose (d) None of these

33 ➤ 33. The two structures of D-glucopyranose forms are:

(a) Enantiomers (b) Epimer (c) Anomers (d) Geometrical isomers

34 ➤ 34. Enzymes are made up of:

(a) Edible proteins (b) Carbohydrates (c) Nitrogen containing carbohydrates (d) Proteins with specific structures

35 ➤ 35. Which of the following is correct about enzymes?

(a) It reduces the activation energy (b) It increases the activation energy (c) It changes the equilibrium constant (d) None of these

36 ➤ 36. Which amino acid is achiral?

(a) Histidine (b) Valine (c) Proline (d) None of these

37 ➤ 37. The reason for double helical structure of DNA is operation of:

(a) Van der waals forces (b) Hydrogen bonding (c) Dipole–dipole moment (d) Electrostatic attractions

38 ➤ 38. Fibrous protein are insoluble in

(a) Water (b) Strong base (c) Strong acid (d) Both (b) And (c)

39 ➤ 39. The α-amino acid which contains an aromatic side chain is

(a) Proline (b) Tyrosine (c) Valine (d) Tryptophan

40 ➤ 40. Tertiary structure of protein contains which type of forces?

(a) Electrostatic, hydrogen bonds, van der Waals forces, dipole-dipole attractions and disulphide cross linkage (b) Electrostatic, hydrogen bonds and van der Waals forces (c) Electrostatic forces only (d) Electrostatic as well as hydrogen bonds

41 ➤ 41. Which of the following is an enzyme?

(a) Lipids (b) Sucrose (c) Emulsin (d) Maltose

42 ➤ 42. The enzyme which hydrolyses triglycerides to fatty acids and glycerol is called:

(a) Pepsin (b) Zymase (c) Maltose (d) Lipase

43 ➤ 43. Lack of essential amino acids in the diet leads to the disease:

(a) Kwashiorkar (b) Sickle cell anaemia (c) Night blindness (d) Pernicious anaemia

44 ➤ 44. Peptides are formed from:

(a) Aliphatic amines (b) Carbohydrates (c) α-amino acids (d) Aromatic amines

45 ➤ 45. Which of the following amino acid is optically inactive?

(a) Phenyl amine (b) Asparagine (c) Glutamic acid (d) Glycine

46 ➤ 46. Primary structure of protein contains which type of bond?

(a) Only hydrogen (b) Only covalent (c) Only van der Waals (d) All of these

47 ➤ 47. Strecker reaction is used for synthesis of:

(a) Alcohol (b) Amino acid (c) Aldehyde (d) Ketone

48 ➤ 48. Denaturation of protein is caused by:

(a) Addition of detergent (b) Changing the pH (c) Addition of urea (d) All of these

49 ➤ 49. The protein of the haemoglobin converts CO2 of the tissues into:

(a) O2 and C (b) HCO3 – and Fe2+ (c) O2 and CO (d) HCO3– and H+

50 ➤ 50. Which sugar is present in DNA?

(a) Purine only (b) Deoxyribose (c) Ribose (d) Pyrimidine only

51 ➤ 51. Which of the following is not present in a nucleotide?

(a) Cytosine (b) Guanine (c) Adenine (d) Tyrosine

52 ➤ 52. What structural feature distinguishes proline from other natural α-amino acids?

(a) It is optically active (b) It is a di-carboxylic acid (c) It is a s◦-amine (d) It has an aromatic group

53 ➤ 53. Which base is present in RNA but not in DNA?

(a) Uracil (b) Thymine (c) Cytosine (d) Guanine

54 ➤ 54. Glycosamine unit is present in:

(a) Heparin (b) Nucleic acid (c) Chitin (d) All of these

55 ➤ 55. Which of the following biomolecules contain nontransition metal ion?

(a) Vitamin B12 (b) Chlorophyll (c) Haemoglobin (d) Insulin

56 ➤ 56. The nucleic acid base having two possible binding sites is:

(a) Cytosine (b) Guanine (c) Adenine (d) Thymine

57 ➤ 57. A nanopeptide contains …….. peptide linkages.

(a) 10 (b) 8 (c) 9 (d) 18

58 ➤ 58. The coordination number of Fe(II) in oxyhaemoglobin is:

(a) 10 (b) 8 (c) 6 (d) 4

59 ➤ 59. Which one of the following compounds exists as a dipolar ion?

(a) Carbohydrate (b) Amino acid (c) Long chain fatty acids (d) α-halo carbonyl compound

60 ➤ 60. The number of tri peptide formed by three different amino acids are?

(a) 3 (b) 4 (c) 5 (d) 6

61 ➤ 61. Which of the following contain prosthetic group?

(a) Glycoprotein (b) Haemoglobin (c) Nucleoprotein (d) All of these

62 ➤ 62. In biological systems, the RNA molecules direct the synthesis of specific proteins which are characteristics of each kind of organism. This process is known as:

(a) Transcription (b) Mutation (c) Replication (d) Translation

63 ➤ 63. Which of the following reagent is used to distinguish the C-terminal end in a polypeptide?

(a) Hydrazine (b) 2, 4 di nitro fluoro benzene (c) 3, 5 di nitro fluoro benzene (d) 2, 4 di amino fluoro benzene

64 ➤ 64. The base found in DNA but not in RNA is

(a) Cytosine (b) Guanine (c) Thymine (d) Adenine

65 ➤ 65. Which of the following has magnesium?

(a) Carbonic anhydrase (b) Haemocyanin (c) Chlorophyll (d) Vitamin B12

66 ➤ 66. An example for a saturated fatty acid, present in nature is:

(a) Oleic acid (b) Linoleic acid (c) Linolenic acid (d) Palmitic acid

67 ➤ 67. The group linkage present in fats is:

(a) Peptide linkage (b) Ester linkage (c) Glycosidic linkage (d) None of these

68 ➤ 68. The group present in waxes are:

(a) Acid group (b) Ester group (c) Alcoholic group (d) Ether group

69 ➤ 69. The best solvent for removing butter stain from

cloth is: (a) H2O (b) C2H5OH (c) C2H5OC2H5 (d) CHCl3

70 ➤ 70. Complete hydrolysis of cellulose gives

(a) D-fructose (b) D-glucose (c) D-ribose (d) L-glucose

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