biochemistry MCQs – Page 5

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

biochemistry Mcqs
81. Dietary fibre is rich in_____________?
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A. Starch

B. Collagen

C. Inulin

D. Cellulose
82. Enzymes concerned with the citric acid cycle are found in the____________?
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A. Mitochondria

B. Ribosomes

C. Nonparticulate cytoplasm

D. Nucleus

83. In TCA cycle substrate level phosphorylation occurs at____________?
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A. None of the above

B. Thiokinase

C. Succinate dehydrogenase

D. Malonate reduction

84. The key enzyme of gluconeogenesis is______________?
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A. Phosphoenol pyruvate carboxykinase

B. Glucose 6 phosphatase

C. Pyruvate carboxylase

D. Fructose 1,6 disphosphatase

85. Which one of the following is a monosaccharide______________?
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A. Strach

B. Sucrose

C. Maltose

D. Fructose
86. In prolonged starvation the main nergy source of brain is_____________?
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A. Fatty acids

B. Ketone bodies

C. Fructose

D. Glucose

87. Which of the following is correct of the pyruvate dehydrogenase enzyme complex ?
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A. It is present in cytoplasm

B. Catalyzes the conversion of pyruvate to oxaloacetate

C. Catalyzes a reversible reaction

D. Requires TPP as cofactor
88. Enzymes help by____________?
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A. Decreasing the surface tension

B. Lowering the activation energy

C. Increasing the substrate concentration

D. Increasing the activation energy

89. An enzyme that makes a double stranded DNA copy from a single stranded RNA template molecule is known as____________?
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A. Phospho kinase

B. RNA polymerase

C. DNA polymerase

D. Reverse transcriptase
90. Nor epinephrine is converted to epinephrine by______________?
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A. Dopa decarboxylase

B. O-methylation

C. Dopamine hydroxylase

D. N-methylation
91. The amino acid required for the synthesis of haem is______________?
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A. Glycine

B. Lysine

C. Glutamic acid

D. Glutamine

92. Golgi bodies function are______________?
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A. Protein synthesis

B. None of the above

C. Sorting of glycoproteins

D. Protein lipid synthesis

93. One of the earliest symptoms of Vit. A deficiency is________________?
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A. Bitots spot

B. Keratomalacia

C. Nyctalopia

D. Xerophthalmia

94. Dehydrogenase used as coenzymes all of the following, except________________?
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A. NADP+

B. FMN

C. FAD

D. Ferro protoporphyrin
95. Km of an enzyme is_____________?
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A. Numerically identical for all isozymes that catalyses a given reaction

B. Substrate concentration at half maximal velocity

C. Dissociation constant

D. The normal physiological substrate concentration

96. Michaelis-Menten hypothesis states that_____________?
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A. Rate of enzymatic reaction is independent of substrate concentration

B. Enzyme- substrate complex formation is essential in enzymatic reaction

C. Rate of non enzymatic reaction is proportional to substrate concentration

D. Km is the enzyme substrate complex association constant

97. Which cell organelle contains DNA_____________?
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A. Mitochondrion

B. Centriole

C. Golgi body

D. Endoplasmic reticulum

98. Megnesium is needed for the activity of which enzymes ?
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A. Dismutase

B. ATPase

C. Aldolase

D. Phosphatase

99. The enzyme involved in the first committed step of glycolysis is____________?
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A. Glucose-6-Phosphatase

B. Phosphofructokinase

C. Enolase

D. Hexokinase
100. Which of the following is not a polymer of glucose?
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A. Amylase

B. Glycogen

C. Inulin

D. Cellulose