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Biochemistry ( Part-2 ) MCQs with Answers

BIOCHEMISTRY 

51. All proteins contain the
(A) Same 20 amino acids
(B) Different amino acids
(C) 300 Amino acids occurring in nature
(D) Only a few amino acids

52. Proteins contain
(A) Only L- α – amino acids
(B) Only D-amino acids
(C) DL-Amino acids
(D) Both (A) and (B)

53. The optically inactive amino acid is
(A) Glycine
(B) Serine
(C) Threonine
(D) Valine

54. At neutral pH, a mixture of amino acids in solution would be predominantly:
(A) Dipolar ions
(B) Nonpolar molecules
(C) Positive and monovalent
(D) Hydrophobic

55. The true statement about solutions of amino acids at physiological pH is
(A) All amino acids contain both positive and negative charges
(B) All amino acids contain positivelyn charged side chains
(C) Some amino acids contain only positive charge
(D) All amino acids contain negatively charged side chains

56. pH (isoelectric pH) of alanine is
(A) 6.02
(B) 6.6
(C) 6.8
(D) 7.2

57. Since the pK values for aspartic acid are 2.0, 3.9 and 10.0, it follows that the isoelectric (pH) is
(A) 3.0
(B) 3.9
(C) 5.9
(D) 6.0

58. Sulphur containing amino acid is
(A) Methionine
(B) Leucine
(C) Valine
(D) Asparagine

59. An example of sulphur containing amino acid is
(A) 2-Amino-3-mercaptopropanoic acid
(B) 2-Amino-3-methylbutanoic acid
(C) 2-Amino-3-hydroxypropanoic acid
(D) Amino acetic acid

60. All the following are sulphur containing amino acids found in proteins except
(A) Cysteine
(B) Cystine
(C) Methionine
(D) Threonine

61. An aromatic amino acid is
(A) Lysine
(B) Tyrosine
(C) Taurine
(D) Arginine

62. The functions of plasma albumin are
(A) Osmosis
(B) Transport
(C) Immunity
(D) Both (A) and (B)

63. Amino acid with side chain containing basic groups is
(A) 2-Amino 5-guanidovaleric acid
(B) 2-Pyrrolidine carboxylic acid
(C) 2-Amino 3-mercaptopropanoic acid
(D) 2-Amino propanoic acid

64. An example of ααα-amino acid not present in proteins but essential in mammalian metabolism is
(A) 3-Amino 3-hydroxypropanoic acid
(B) 2-Amino 3-hydroxybutanoic acid
(C) 2-Amino 4-mercaptobutanoic acid
(D) 2-Amino 3-mercaptopropanoic acid

65. An essential amino acid in man is
(A) Aspartate
(B) Tyrosine
(C) Methionine
(D) Serine

66. Non-essential amino acids
(A) Are not components of tissue proteins
(B) May be synthesized in the body from essential amino acids
(C) Have no role in the metabolism
(D) May be synthesized in the body in diseased states

67. Which one of the following is semiessential amino acid for humans?
(A) Valine
(B) Arginine
(C) Lysine
(D) Tyrosine

68. An example of polar amino acid is
(A) Alanine
(B) Leucine
(C) Arginine
(D) Valine

69. The amino acid with a nonpolar side chain is
(A) Serine
(B) Valine
(C) Asparagine
(D) Threonine

70. A ketogenic amino acid is
(A) Valine
(B) Cysteine
(C) Leucine
(D) Threonine

71. An amino acid that does not form a ααα-helix is
(A) Valine
(B) Proline
(C) Tyrosine
(D) Tryptophan

72. An amino acid not found in proteins is
(A) β-Alanine                                                                                                                                                                                 (B) Proline
(C) Lysine                                                                                                                                                                                       (D) Histidine

73. In mammalian tissues serine can be a biosynthetic precursor of
(A) Methionine
(B) Glycine
(C) Tryptophan
(D) Phenylalanine

74. A vasodilating compound is produced by the decarboxylation of the amino acid:
(A) Arginine
(B) Aspartic acid
(C) Glutamine
(D) Histidine

75. Biuret reaction is specific for
(A) – CONH-linkages
(B) – CSNH2 group
(C) – (NH) NH2 group
(D) All of these

76. An example of a hydroxy fatty acid is
(A) Ricinoleic acid
(B) Crotonic acid
(C) Butyric acid
(D) Oleic acid

77. An example of a saturated fatty acid is
(A) Palmitic acid
(B) Oleic acid
(C) Linoleic acid
(D) Erucic acid

78. If the fatty acid is esterified with an alcohol of high molecular weight instead of glycerol, the resulting compound is
(A) Lipositol
(B) Plasmalogen
(C) Wax
(D) Cephalin

79. A fatty acid which is not synthesized in the body and has to be supplied in the diet is
(A) Palmitic acid
(B) Lauric acid
(C) Linolenic acid
(D) Palmitoleic acid

80. Essential fatty acid:
(A) Linoleic acid
(B) Linolenic acid
(C) Arachidonic acid
(D) All these

81. The fatty acid present in cerebrosides is
(A) Lignoceric acid
(B) Valeric acid
(C) Caprylic acid
(D) Behenic acid

82. The number of double bonds in arachidonic acid is
(A) 1
(B) 2
(C) 4
(D) 6

83. In humans, a dietary essential fatty acid is
(A) Palmitic acid
(B) Stearic acid
(C) Oleic acid
(D) Linoleic acid

84. A lipid containing alcoholic amine residue is
(A) Phosphatidic acid
(B) Ganglioside
(C) Glucocerebroside
(D) Sphingomyelin

85. Cephalin consists of
(A) Glycerol, fatty acids, phosphoric acid and choline
(B) Glycerol, fatty acids, phosphoric acid and ethanolamine
(C) Glycerol, fatty acids, phosphoric acid and inositol
(D) Glycerol, fatty acids, phosphoric acid and serine

86. In mammals, the major fat in adipose tissues is
(A) Phospholipid
(B) Cholesterol
(C) Sphingolipids
(D) Triacylglycerol

87. Glycosphingolipids are a combination of
(A) Ceramide with one or more sugar residues
(B) Glycerol with galactose
(C) Sphingosine with galactose
(D) Sphingosine with phosphoric acid

88. The importance of phospholipids as constituent of cell membrane is because they possess
(A) Fatty acids
(B) Both polar and nonpolar groups
(C) Glycerol
(D) Phosphoric acid

89. In neutral fats, the unsaponificable matter includes
(A) Hydrocarbons
(B) Triacylglycerol
(C) Phospholipids
(D) Cholsesterol

90. Higher alcohol present in waxes is
(A) Benzyl
(B) Methyl
(C) Ethyl
(D) Cetyl

91. Kerasin consists of
(A) Nervonic acid
(B) Lignoceric acid
(C) Cervonic acid
(D) Clupanodonic acid

92. Gangliosides are complex glycosphingolipids found in
(A) Liver
(B) Brain
(C) Kidney
(D) Muscle

93. Unsaturated fatty acid found in the cod liver oil and containing 5 double bonds is
(A) Clupanodonic acid
(B) Cervonic acid
(C) Elaidic acid
(D) Timnodonic acid

94. Phospholipid acting as surfactant is
(A) Cephalin
(B) Phosphatidyl inositol
(C) Lecithin
(D) Phosphatidyl serine

95. An oil which contains cyclic fatty acids and once used in the treatment of leprosy is
(A) Elaidic oil
(B) Rapeseed oil
(C) Lanoline
(D) Chaulmoogric oil

96. Unpleasant odours and taste in a fat (rancidity) can be delayed or prevented by the addition of
(A) Lead
(B) Copper
(C) Tocopherol
(D) Ergosterol

97. Gangliosides derived from glucosylceramide contain in addition one or more molecules of
(A) Sialic acid
(B) Glycerol
(C) Diacylglycerol
(D) Hyaluronic acid

98. ’Drying oil’, oxidized spontaneously by atmospheric oxygen at ordinary temperature and forms a hard water proof material is
(A) Coconut oil
(B) Peanut oil
(C) Rape seed oil
(D) Linseed oil

99. Deterioration of food (rancidity) is due to presence of
(A) Cholesterol
(B) Vitamin E
(C) Peroxidation of lipids
(D) Phenolic compounds

100. Molecular formula of cholesterol is
(A) C27H45OH
(B) C29H47OH
(C) C29H47OH
(D) C23H41OH

 

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