BioMolecules MCQs – III

1) The enzyme pepsin hydrolyses
a) proteins to amino acids
b) fats to fatty acids
c) glucose to ethyl alcohol
d) polysaccharides to monosaccharides.

2) Which of the following gives maximum energy in metabolic processes ?
a) Protein
b) Vitamins
c) Lipids
d) Carbohydrates.

3) Which of the following are oligosaccharides ?
a) Cellobiose
b) Raffinose
c) Lyxose
d) Stachyrose

4) The hormone which controls the processes of regulating sugar levels in the body is
a) Cortisone
b) Adrenaline
c) Thyroxine
d) Insulin

5) Which of the following has magnesium ?
a) Carbonic anhydrase
b) Haemocyanin
c) Chlorophyll

6) Which of the following is not a sex hormone ?
a) Testosterone
b) Estradiol
c) Estrone
d) Cortisone.

7) Which of the following vitamins contains isoprene units ?
a) A
b) E
c) C
d) K

8) Which of the following hormones contains iodine ?
a) Adrenaline
b) Testosterone
c) Thyroxine
d) Insulin

9) The primary product of photosynthesis in green plants is
a) Fructose
b) Glucose
c) Maltose
d) Cellulose

10) Which of the following is provitamin A ?
b) Calciferol
c) Chlorophyll
d) Ergosterol.

11) All except one may be caused by a virus:
a) Poliomyelitis
b) Influenza
c) Malaria
d) Small pox

12) Which component of the typical birth control pill is responsible for regulating the menstrual cycle ?
a) Androgen
b) Estrogen
c) Progesterone
d) Oxytocin

13) The human body does not produce
a) Enzymes
b) Vitamins
c) Proteins
d) Nucleic acids

14) Which of the following diseases is genetically linked ?
b) Leucoderma
c) Colour blindness
d) Epilepsy

15) To which group does the universal recipient in blood transfusion belong ?
a) A
b) B
c) AB
d) O

16) Which of the following is not a biotechnology product?
a) Interferon
b) Insulin
c) Vaccines
d) Cortisone

17) Increased blood pressure may be caused by the excess secretion of
a) Thyroxine
b) Testosterone
c) Estradiol
d) Adrenaline

18) A vitamin which contains both nitrogen and sulphur is
a) Vitamin A

19) A vitamin that contains both N and P is
a) Vitamin K
b) Vitamin D
d) Vitamin C

20) Interferon is
a) the commercial name given to a tonic containing iron
b) an alloy of iron and chromium used in space vessles
c) a protein derived from the body against viruses
d) a trade name of a potent insecticide

21) Vitamin C is a/an
a) lactone
b) amine
c) amide
d) alcohol

22) The organs which help in the digestion of starch are
a) Mouth
b) Small intestine
c) Both a and b
d) large intestine

23) Which of the following are peptide hormones ?
a) Insulin
b) Oxytocin
c) Vasopressin
d) All the above

24) The non-protein part which some enzymes require for their activity are called Â
a) Cofactors
b) Coenzyme
c) Both (a) and (b)
d) Apoenzyme

25) Which of the following vitamins do not contain nitrogen ?
a) Vitamin A
b) Vitamin C
c) Vitamin D
d) None of the above

26) Globular proteins are present in
a) Blood
b) Eggs
c) Milk
d) All the above

27) Vitamin B1 is a derivative of
a) Pyrimidine
b) Purine
c) Thiazole
d) Both (a) and (c)

28) Vitamin C is called
a) Antioxidant
b) Antiscurvy
c) Both (a) and (b)
d) Antirachtic

29) Vitamin D is called
a) Ergocalciferol
b) Antirachitic factor
c) Sunshine vitamin
d) All the above

30) Which of the following hormones do not contain nitrogen ? Â
a) Progesterone
b) Epinephrine
c) Androsterone
d) Both (a) and (c)

31) Among the following pick out the proteases:
a) Amylase
b) Chymotripsin
c) Pepsin
d) Both (b) and (c)

32) Which of the following are congenital diseases ?
b) Sickle cell anaemia
c) Colour blindness
d) Both (b) and (c)

33) A carbohydrate which cannot be hydrolysed to simpler compounds is called a
a) Monosaccharide
b) Disaccharide
c) Polysaccharide
d) Oligosaccharide

34) A disaccharide on hydrolysis gives
a) Two molecules of the same monosaccharide.
b) One molecule each of two different monosaccharides.
c) Three molecules of the same monosaccharide.
d) Two molecules of the same or one molecule each of the two different monosaccharides.

35) Which of the following is not an oligosaccharide ?
a) Xylose
b) Maltose
c) Raffinose
d) Stachyrose

36) Raffinose on hydrolysis gives
a) Glucose.
b) Fructose.
c) Galactose.
d) All the above.

37) Monosaccharides which contain an aldehyde group are called
a) Acetals
b) Aldoses
c) Aldols
d) Ketoses

38) Monosaccharides which contain a keto group are called
a) Ketols
b) Ketenes
c) Ketoses
d) Ketals

39) Monosaccharides contain
a) Always six carbon atoms
b) Always four carbon atoms
c) Always five carbon atoms
d) 3 to 7 carbon atoms.

40) Which of the following carbohydrates is a monosaccharide?
a) Sucrose
b) Maltose
c) Fructose
d) Starch

41) Glucose is a/an
a) Aldohexose
b) Aldopentose
c) Aldotetrose
d) Ketohexose

42) An example of a ketohexose is
a) Glucose
b) Galactose
c) Fructose
d) Mannose

43) Which one of the following is a pentose sugar ?
a) Ribose
b) Lyxose
c) Arabinose
d) All the three

44) Sucrose reacts with acetic anhydride to form
a) Penta-acetate
b) Hexa-acetate
c) Tetra-acetate
d) Octa-acetate

45) All monosaccharides containing five or six carbon atoms may have
a) Open chain structures
b) Pyranose structures
c) Furanose structures
d) Pyranose or furanose structures.

46) A dextrorotatory sugar present in fruits is
a) Glucose
b) Fructose
c) Cellulose
d) Starch

47) Which of the following is a reducing sugar ?
a) Glucose
b) Fructose
c) Maltose
d) All the three above

48) Which of the following reduces Tollens reagent?
a) Glucose
b) Fructose
c) Maltose
d) All the above

49) Which of the following is a non-reducing sugar ?
a) Sucrose
b) Ribose
c) Maltose
d) Lactose

50) Glucose reduces
d) All.

51) The reagent used to detect sugar (glucose) in the urine is

52) A useful derivative employed in the identification of reducing sugars is
a) Oxime
b) Osone
c) Osazone
d) Phenylhydrazone

53) The reagent which forms a crystalline osazone derivative when reacted with glucose is
c) Hydroxylamine
d) Phenylhydrazine

54) Which of the following form osazone with phenylhydrazine?
a) Glucose
b) Fructose
c) Maltose
d) All the three above.

55) Glucose and fructose are
a) Optical isomers
b) Chain isomers.
c) Functional Isomers
d) Tautomers

56) Glucose exists in two stereoisomeric forms— and -forms. These are related to each other as
a) Epimers
b) Anomers
c) Optical isomers
d) Functional isomers.

57) Glucose reacts with methanol in presence of dry HCI gas to give
d) Both (a) and (b).

58) The change in specific rotation with time of a freshly prepared solution of a reducing sugar is known as
a) Specific rotation.
b) Optical rotation .
c) Mutarotation
d) Inversion

59) Glucose and mannose are
a) Optical isomers
b) Anomers
c) Epimers
d) Chain isomers.

60) Carbohydrates are detected by the
a) Molisch test
b) Carbylamine test
d) Haloform test.

61) Which of the following is a disaccharide ?
a) Cellobiose
b) Cellulose
c) Starch
d) Fructose

62) The acid or enzymatic hydrolysis of sucrose to give an equimolar mixture of glucose and fructose is called
a) Esterification
b) Inversion
c) Saponification
d) Insertion

63) The function of glucose is to
a) Provide energy
b) Promote growth
c) Prevent diseases
d) Perform all the above.

64) Lactose is a disaccharide of
a) Glucose only
b) Glucose and fructose
c) Glucose and galactose
d) Galactose only.

65) Which carbohydrate is used in silvering of mirrors ?
a) Sucrose
b) Glucose
c) Fructose
d) Starch

66) Which of the following carbohydrates is an essential constituent of all cell-walls ?
a) Starch
b) Maltose
c) Cellulose
d) Sucrose

67) Proteins are condensation polymers of

68) Proteins are
a) Polycarboxylic acids.
b) Polyhydric alcohols
c) Polyesters
d) Polyamides

69) A mixture of -amino acids is obtained when proteins are hydrolysed by
a) Acids
b) Enzymes
c) Bases
d) All

70) The peptide bond is
b) —CONH—
d) —N = C = O.

71) Which of the following does not contain a chiral carbon ?
a) Glycine
b) Alanine
c) Phenylalanine
d) Valine

72) In aqueous solutions, amino acids mostly exist as

73) Which one of the following is not an essential amino acid?
a) Valine
b) Leucine
c) Lysine
d) Alanine

74) Rice is deficient in
a) Lysine
b) Alanine
c) Glycine
d) Isoleucine

75) Which of the following is a fibrous protein?
a) Haemoglobin
b) Albumin
c) Keratin
d) Enzymes

76) Which of the following is a globular protein?
a) Collagen
b) Myoglobin and Haemoglobin
c) Myosin
d) Fibroin

77) Denaturation of proteins can be carried out by
a) Heat
b) Bases
c) Mineral acids.
d) All of the above.

78) Cheese is a
a) Globular protein
b) Conjugated protein
c) Denatured protein
d) Derived protein

79) The sequence in which acids are linked to one another in a protein molecule is called its
a) Primary structure
b) Secondary structure
c) Tertiary structure
d) Quaternary structure.

80) Mark the wrong statement about denaturation of proteins.
a) The primary structure of the protein does not change.
b) Globular proteins are converted into fibrous proteins.
c) Fibrous proteins are converted into globular proteins.
d) The biological activity of the protein is destroyed.

81) The non-protein portion of a protein is called the
a) Functional group
b) Characteristic group
c) Prosthetic group
d) Enolic group.

82) A prosthetic group is present in
a) Simple proteins
b) Conjugated proteins
c) Vitamins
d) Hormones

83) The prosthetic group present in glycoproteins is:
a) Phosphoric acid
b) Carbohydrate.
c) Nucleic acid
d) Lipid

84) The function of proteins is to act as
a) Structural materials of animal tissues
b) Metabolic regulators
c) Enzymes and antibodies
d) All the three above.

85) The disease sickle cell anaemia is caused by a
a) Deficiency of proteins
b) Deficiency of vitamins
c) Defective haemoglobin
d) Malfunctioning of the pancreas.

86) Enzymes are
a) Carbohydrates.
b) Fibrous proteins.
c) Globular proteins.
d) Nucleic acids.

87) The- non-protein component in enzymes which is necessary for its biological activity is called the
a) Coenzyme.
b) Nucleic acid
c) Lipid
d) Phosphoric acid

88) The coenzymes are derived from
a) Lipids
b) Hormones
c) Vitamins
d) Carbohydrates.

89) Mark the wrong statement about enzymes:
a) Enzymes are biological catalysts.
b) Each enzyme can catalyse a number of similar reactions
c) Enzymes are very efficient catalysts
d) Enzymes are needed only in very small amounts for their action.

90) Which of the following enzymes hydrolyse proteins to ?
a) Trypsin
b) Pepsin
c) Chymotrypsin
d) All the above.

91) The enzyme which hydrolyses sucrose to a mixture of glucose and fructose is called
a) Invertase.
b) Sucrase
c) Maltase
d) Both (a) and (b)

92) The disease phenylketonuria is caused by the deficiency of
a) Phenylalanine hydroxylase.
b) Vitamin A
c) Leucine.
d) Lysine

93) The disease albinism is caused by the deficiency of
a) Tyrosinase.
b) Emulsin.
c) Lactase.
d) Phenylalanine hydroxylase

94) The prosthetic group present in nucleoproteins is
a) Nucleic acids .
b) Lipids
c) Carbohydrates
d) Phosphoric acid

95) Which of the following constitutes the genetic material of the cell?
a) Nucleic acids
b) Proteins
c) Lipids
d) Carbohydrates

96) The sugar present in DNA is
a) Ribose
b) Fructose.
c) Glucose
d) Deoxyribose

97) The pentose sugar present in RNA is
a) Ribose .
b) Fructose.
c) Glucose.
d) Deoxyribose

98) The pentose sugar in DNA and RNA has the:
a) Pyranose structure.
b) Open chain structure.
c) Furanose structure.
d) None of the above.

99) Which of the following is not a purine ?
a) Thymine
b) Adenine
c) Cytosine
d) Guanine

100) Which of the following is not a pyrimidine ?
a) Uracil
b) Cytosine
c) Thymine
d) Guanine

Answer :

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