biochemistry MCQs – Page 4

Practise focused biochemistry questions with marked answers for exam preparation and subject revision.

biochemistry Mcqs
61. Increase in pyruvate and lactate is seen in which of the following deficiency ?
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A. Vitamin C

B. Thiamine

C. Pyridoxine

D. Niacin

62. Enzymes are classified according to_________________?
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A. Nature of the enzymes

B. Action on substrate

C. Action of coenzymes

D. All of the above

63. Gluconeogenesis occurs in the liver and _______?
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A. Fat

B. Heart

C. Muscle

D. Kidney
64. McArdles disease is due to the deficiency of_____________?
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A. Myophosphorylase

B. Glucose 6 phosphatase

C. Glucose 1 phosphatase

D. Glucose 1,6 phosphatase

65. Krebs cycle occurs in _________ conditions?
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A. Anaerobic

B. Microaerophilic

C. Aerobic

D. Aerobic and anaerobic

66. In mycocarrdial infarction the first enzyme to rise____________?
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A. SGOT

B. CPK

C. Amylase

D. LDH

67. To keep blood PH at 7.4 the HCO3 : H2CO3 ratio should be_____________?
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A. 15:01

B. 30:01:00

C. 1:01

D. 20 : 1
68. All these reactions take place inside the mitochondria except____________?
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A. EMP pathway

B. Urea cycle

C. Krebs cylce

D. Electron transfer

69. Iron is present in all of the following except_______________?
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A. Catalase

B. Myoglobin

C. Pyruvate kinase

D. Cytochrome

70. An example of layses is_____________?
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A. Amylase

B. Glutamine synthetase

C. Fumarase

D. Cholinesterase

71. The tissue with the highest glycogen content (mg/100gm)_____________?
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A. Muscle

B. Kidneys

C. Liver

D. Testes

72. Which acid is formed in the citric acid cycle ?
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A. Oxaloacetic acid

B. None of the above

C. Glutamic acid

D. Nitric acid

73. Which one of the following enzymes provides a link between glycolysis and the citric acid cycle ?
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A. Pyruvate dehydrogenase

B. Lactate dehydrogenase

C. Citrate synthase

D. Pyruvate kinase

74. Renal threshold for glucose is______________?
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A. 200 mg%

B. 180 mg/ dl

C. 100 mg%

D. 80 mg%

75. Insulin acts on which enzyme in glycolysis ?
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A. Glucose 6 phosphatase

B. Adenylate kinase

C. Glucokinase

D. Hexokinase

76. Most lipogenic____________?
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A. Glucose

B. Galactose

C. Ribose

D. Fructose
77. When the prosthetic group of an enzyme is an inorganic ion, it is called a_____________?
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A. Apoenzyme

B. Coenzyme

C. Cofactor

D. Holoenzyme

78. Number of ATP molecules generated in the conversion of glycogen of lactate is_____________?
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A. 2

B. 38

C. 36

D. 32

79. Fraction of CPK is an enzyme that is elevated in a myocardial infarct is____________________?
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A. MM fraction

B. MB fraction

C. BB fraction

D. Both MM and BB fraction

80. During phagocytosis the metabolic process called respiratory burst involves activation of_____________?
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A. Hydrolase

B. Dehydrogenase

C. Peroxidase

D. Oxidase