NEET UG Chemistry Biomolecule MCQs

1) _____is a biomolecule.

(A) protein (B) enzyme (C) lipid (D) all of above

2) _____is not a biomolecule.

(A) vitamin (B) nucleic acid (C) formic acid (D) carbohydrate

3) What is the proportion of hydrogen and oxygen in molecule of all member of carbohydrate ?

(A) 2:1 (B) 1:1 (C) 1:2 (D) no certain ratio

4) Which carbohydrate isn’t soluble in water and tasteless ?

(A) monosaccharide (B) trisaccharide (C) oligosaccharide (D) none of above

5) Which carbohydrate isn’t soluble in water and tasteless ?

(A) lactose (B) dextrin (C) fructose (D) melitriose

6) General formula for________ carbohydrate is C_n H_2n-6 O_n-3 

(A) Disaccharide (B) Trisaccharide (C) tetrasaccharide (D) polysaccharide

7) Cyclic configuration for glucose is called Glucopyranose , because its cyclic chain contains __________carbons & __________oxygens.

(A) 6,1 (B) 6,2 (C) 5,1 (D) 4,1

8) Solubility of glucose in alcohol is

(A) not soluble (B) soluble (C) more soluble (D) soluble in more alcohol

9) When rotation of an optically active organic compound is measured as anticlockwise then if is know as

(A) lewrotation (B) levoratatory (C) (-) (D) ail of above

10) which carbon is anomeric carbon in cyclic structure of glucose?

(A) C₁ (B) C₂ (C) C₃ (D) C₄

11) Which carbon is anomeric carbon in cyclic structure of fructose ?

(A) C₁ (B) C₂ (C) C₃ (D) C₄

12) What is the specific rotation of aqueous Solution of sucrose ? [before hydrolysis]

(A) +19° (B) +52.5⁰ (C) +66.5⁰ (D) 112⁰

13) What’s the name of phenomenon when rotation of sucrose solution reversed ?

(A) conversion (B) inversion (C) diversion (D) reversion

14) Which optical rotation has been obtained by aqueous solution of sucrose mixture , which is produced before hydrolysis of and after hydrolysis of sucrose ?

(A) Dextrorotatory , levorotatory (B) levorotatory , Dextrorotatory

(C) levorotatory , levorotatory (D) Dextrorotatory , Dextrorotatory

15) Two monosaccharide units of sucrose are linked by which carbon chain ?

(A) Cl-O-Cl (B) C2-O-C2 (C) C1-O-C6 (D) C1-O-C2 

16) In sucrose α-D-(+)-glucose and β-D-(-)- Glucose are linked by________ chain

(A) glycolipid (B) glycosidic (C) phospholipid (D) phosphosidic

17) Which is non-reducing sugar?

(A) glucose (B) fructose (C) sucrose (D) A&B both

18) Which is chosen as standard for Sweetness of sugar?

(A) sucrose (B) glucose (C) fructose (D) lactose

19) Which substance is produced by heating sucrose at 486 K temperature ?

(A) sucralose (B) elitem (C) caramel (D) arneto

20) Which substance is soluble in alcohol ?

(A) glucose (B) fructose (C) maltose (D) all of above

21) Two monosaccharide units of maltose are linked by which carbon chain ?

(A) C₁-O-C₁ (B) C₁-O-C₂ (C) C₁-O-C₃ (D) C₁-O-C₄

22) Which is reducing sugar?

(A) lactose (B) maltose (C) fructose (D) all of above

23) What are the sweetness index of fructose , glucose and lactose respectively

(A) 74,173,16 (B)16,173,74 (C) 16,74,173 (D) 173,74,16

24) Which substance is produced before obtaining alcohol from the compound containing starch ?

(A) sucrose (B) maltose (C) lactose (D) A & C

25) By hydrolysis of which substance, we obtain two molecules of glucose?

(A) sucrose (B) maltose (C) lactose (D)A&B

26) By hydrolysis of which substance, we obtain one molecules of glucose ?

(A) lactose (B) sucrose (C) A&B (D) none

27) Which sugar reduces fehling’s solution and makes phenyl hydrazone with phenyl hygrazine ?

(A) maltose (B) lactose (C) A&B (D) none

28) Which sugar doesn’t reduce fehling’s Solution ?

(A) sucrose (B) maltose (C) lactose (D) all of above

29) Which sugar is hydrolyzed by emulsine enzyme ?

(A) sucrose (B) maltose (C) lactose (D) all of above

30) Which sugar is dextrorotatory and indicates mutarotation ?

(A) sucrose (B) maltose (C)A&B (D) none

31) Which sugar is dextrorotatory and doesn’t indicate mutarotation ?

(A) sucrose (B) maltose (C) lactose (D) B&C

32) What is the specific rotation of aqueous solution of mixture , which is produced after hydrolysis of sucrose ?

(A) -20° (B) -92° (C) +52.5° (D) +66.5°

33) The specific rotation in inverted sugar during hydrolysis due to specific rotation of glucose solution is_______.(the mixture of glucose and fructose obtained at the end of hydrolysis is called inverted sugar )

(A) -20° (B) -92° (C) +52.5° (D) +66.5°

34) The specific rotation in inverted sugar during hydrolysis due to specific rotation of fructose solution is_________ .(the mixture of glucose and fructose obtained at the end of hydrolysis is called inverted sugar)

(A) -20° (B) -92° (C) +52.5° (D) +66.5°

35) Example of polysaccharide is

(A)starch (B)sucrose (C) cellulose (D)A&C

36) General formula for polysaccharide is

(A) (C₆H₁₀O₅)n (B)C_n+2H_2nO_n (C)C_n+1H_2nO (D)C_nH_2nO_n

37) ___________ is the main component of cell walls of plants.

(A) cellulose (B) starch (C) protein (D) nuclic acid

38) In which solvent, cellulose is soluble ?

(A) water (B)chloroform

(C) ammoniacal cupric hydroxide (D) alcoholic potassium hydroxide

39) Which sugar is not present in vegetable ?

(A)glucose (B)sucrose (C)maltose (D) lactose

40) Which is not a sugar ?

(A) starch (B) sucrose (C) maltose (D) glucose

41) Which substance in animal body can be Converted in glucose and also gives energy when required ?

(A) sucrose (B) glycogen (C) cellulose (D) starch

42) _____________ is not a cellulose .

(A) nylon fibre (B) lilen (C) rayon (D) acetate fibre

43) Protein is/are_________

(A) enzyme (B) hormones (C) antibodies (D) all of above

44) What are the names of scientist, who had obtained many amino acid from hydrolysis of protein ?

(A) Haworth & Hirst (B) Tollens & Tanret (C) Emil Fischer (D) all of above

45) Which amino acid is known as C-terminal residue in alanylglycylphenylalanine ?

(A) alanine (B) glycine (C) phenyl alanine (D) none

46) Molecular mass of polypeptid is_________

(A) 100 (B) upto 10000 (C)upto 20000 (D) upto 1 Crore

47) Molecular mass of protein _________

(A) upto 1000 (B) upto 5000 (C) upto 10000 (D) >10000

48) The polypeptide chains run parallel and are held together by _______bonds.

(A) disulphide (B) covalent

(C) co-ordination-covalent bond (D) none

49) By which bond the polypeptide chains are held together in fibrous protein ?

(A) hydrogen bond (B) covalent bond (C) disulphide bond (D) A&C

50) Which protein is insoluble in water,which is present in muscle ?

(A) myosin (B) albumin (C) keratin (D) insulin

51) In a-helix shaped protein , polypeptide chain is coild in helix shape approximate_______ amino acids are included per turn of helix

(A) 3.6 (B) 48 (C) 60 (D) 72

52) Which isn’t true reason of denaturation of protein ?

(A) detergent (B) change in pH (C) increase in temperature (D) none

53) Which is the reason of denaturation of protein ?

(A) organic solvent (B) detergent (C) adding concentrate alkali (D) all

54) In certain clynical chemistry tests removal of all protein materials , which chemical is added to sample ?

(A) trichloro acetic acid (B) bezoic acid

(C) ethanoic acid (D) benzene sulphonic acid

55) Which is called as coenzyme ?

(A) protein chain (B) inorganic component as cofactor

(C) organic component as co-factor (D) apoenzyme

58) Sucrose is hydrolyzed by__________enzyme

(A) zymase (B) invertaze (C) emulsin (D) lipase

59) Fat soluble vitamin is

(A) H (B) A (C) C (D) B

60) Haemorrhage disease caused by deficiency of___________vitamin

(A) Calciferol (B) phylloquinone (C) Tocopherol (D) retinol

61) Which vitamin isn’t synthesizes from vegetable ?

(A) Cyanocobalamine (B) pyridoxine (C)thiamine (D) Tocopherol

62) Which vitamin’s source is yeast?

(A) B1 (B) H (C) B6 (D) all

63) Which disease caused by deficiency of vitamin E ?

(A) Sterility (B) skin disease

(C) bone deformation in children (D) paralysis

64) Which substance isn’t formed by complete hydrolysis of nucleic acid ?

(A) hexos sugar (B) phosphoric acid

(C) hetrocyclic bases which contains nitrogen element (D) pentose sugar

65) Purine base is

(A) G (B) C (C) T (D) U

66) Pyrimidine base is

(A) C (B) T (C) U (D) All

67) Which base isn’t present in DNA ?

(A) A (B) G (C) C (D) U

68) Which base isn’t present in RNA ?

(A) G (B)T (C) U (D)C

69) A unit formed by attachment of a base to_________ position of sugar is known as nucleoside

(A) Cl (B) C2 (C) C3 (C) C4

70) Unit formed by attachment of which carbon of nucleoside to phosphate ion is known as nucleotide ?

(A) Cl (B)C2 (C)C3 (C)C4

71) Two nucleosides are joined together by phosphodiester linkage, this linkage is formed between ___________ of one sugar and ________ of other sugar.

(A) Cl ,C1 (B) Cl, C3 (C) C3, C5 (D) C5,C5

72) Structure of DNA is look alike _________

(A) spiral straircase (B) double helix (C) twisted rope (D) all

73) Who proposed that structure of DNA is double helix ?

(A) luis & pouling (B) HC crick & JDWatson

(C) howarth & hirst (D) tallence & tenrate

74) By which bond , base of one nucleotide and base of another nucleotide are joined together ?

(A) hydrogen bond (B) covalent bond (C) coordination covalent bond (D) ionic

75) Which pairs of bases are true for linkage between two chain of polynucleiotide ?

(A) adenine-Thymine (B) adenine- guranine

(C) guanine-thymine (D) adenine-cytosine

76) How many hydrogen bonds between base G and Base C are present in structure of DNA ?

(A) 1 (B) 2 (C) 3 (D) no certain number

77) If a person bleeds by his gingiva , so what would you suggest to eat to prevent the disease ?

(A) vegetable oil (B) citrus fruits (C) cheese (D) milk

78) Which subgroup isn’t possible for vitamin ?

(A)B1 (B) B4 (C) B6 (D) B12

79) _________ term is familiar for vitamin now days

(A) vitamin (B) vitamine (C) vitmin (D) viatamine

80) which sugar indicates mutarotation ?

(A) glucose (B) fructose (C) maltose (D) all

81) Which sugar isn’t indicating muta rotation?

(A) sucrose (B) lactose (C) maltose (D) none

82) Molecularmass of_________ carbohydrate is 180 gm/mol

(A) glucose (B) fructose (C) galactose (D) all

83) Molecular mass of_________ sugar is 342 gm/mol

(A) cellobios (B) maltose (C) A&B (D)none

84) Glucose is known as glucopyranose because

(A) cyclicstructure of glucose contains 6 memberring

(B) cyclicstructure of glucose contains 5 carbon atoms and one oxygen atoms

(C) glucose is aldohexose

(D) glucose is ketohexose

85) One base present in central part of DNA, it’s joined to another base with 3 hydrogen bond, so what is that base ?

(A)A (B) G (C)T (D) U

86) One pyrimidine base present in central part of DNA, it’s joined to another base with 2 hydrogen bond, so what is that base ?

(A) A (B) G (C) C (D) T

87) Which reaction isn’tgiven by glucose ?

(A) glucose is oxidized by tollen’s reagent

(B) glucose gives violet color with skiff’s reagent

(C) Fehling’ssolution is reduced by glucose

(D) glucose gives addition product with sodium bisulphite

88) The crystal of glucose obtained from which solvent are dissolved in water and the specific rotation of this freshly prepared solution of glucose is +112 ?

(A) ethyle alcohol (B) aceticacid (C) pyridine (D) A & B

89) Mutarotation for aqueous solution of glucose is_________

(A)+19° (B) +52.5° (C) +112° (D) +119°

90) Which type of carbon is called anomeric carbon in cyclic structure of glucose ?

(A) it’s joined with aldehyde group in open chain structure

(B) it’s carbonyl carbon in open chain structure of glucose

(C) it’s joined with carboxylic group in open chain structure

(D) none