biochemistry MCQs – Page 6

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

biochemistry Mcqs
101. Rate limiting step in adrenaline synthesis is conversion of____________?
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A. Dopamine to nor epinephrine

B. Tyrosine to dopa

C. Phenylalanine to tyrosine

D. Dopa to dopamine

102. Benzidine test is positive with the enzyme______________?
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A. Hydrolase

B. Cytochrome oxidase

C. Dehydrogenase

D. Peroxidase
103. Cofactor required for lipoprotein lipase activity is_______________?
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A. Apo A-II

B. Apo C-III

C. Apo C-II

D. Apo B-II

104. Glycogen synthesis is increased by_____________?
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A. Insulin

B. Epinephrine

C. Cortisone

D. GH

105. Which of the following is precursor of adrenaline and thyroxine synthesis ?
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A. Tyrosine

B. Phenyl alanine

C. None of the above

D. Tryptophan

106. Coenzyme, in an enzymatic reaction usually functions to_____________?
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A. Activate the substrate

B. Accept one of the cleavage products

C. Increase the active sites of apoenzyme

D. Enhance the specificity of apoenzyme

107. All are true regarding glucose 6 phosphate deficiency except______________?
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A. Hyperuricemia

B. Increased mobilization of glycogen from liver

C. Defective cori cycle

D. Hyperglycemia
108. The deficiency of thiamine can be identified by measuring the red cell______________?
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A. Alpha ketoglutarate dehydrogenase

B. Transketaolase

C. Transaldolase

D. Pyruvate dehydrogenase

109. The citric acid cycle is the final pathway for oxidation of______________?
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A. Enzymes

B. None of the above

C. Minerals

D. Vitamins

110. The immediate precursor of norepinephrine is______________?
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A. Tyrosine

B. Phenylalanine

C. Epinephrine

D. Dopamine
111. The enzyme that splits hydrogen peroxide into water and oxygen is_____________?
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A. Cytochrome P 450

B. Cytochromes

C. Super oxide dismutase

D. Catalase
112. Which of the following is a membrane bound enzyme that catalyzes the formation of cyclic AMP from ATP ?
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A. Tyrosine kinase

B. Adenylate cyclase

C. Polymerase

D. ATP synthase

113. 1 molelcule of glucose forms _______ molecules of pyruvate?
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A. 4

B. 1

C. 3

D. 2
114. Biotin is required for the activity of_____________?
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A. Phosphohexose isomerase

B. Pyruvate carboxylase

C. Succinate thiokinase

D. Lactate dehydrogenase

115. The main pathways of metabolism in brain are______________?
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A. Glycolysis and citric acid cycle

B. Embden-Meyerhof Pathway and H.M.P shunt

C. Glycogenolysis and Gluconeogenesis

D. Glycogenolysis and Citric and cycle

116. The main site of fluoride inhibition in the Embden Meyerhof pathway of acid____________?
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A. Pyruvate Kinase

B. ATPase

C. Enolase

D. Fructose 6 phosphatase

117. Enzymes involved in degradation of epinephrine_____________?
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A. Oxidases

B. Anticholinesterases

C. Cholinesterase

D. Catechol 0-transferase
118. Calcitonin is antagonist_______________?
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A. Thyroxine

B. Parathyroid hormone

C. Serotonin

D. Triidothyronine

119. In which type of glycogen storage disease is hyper uricemia a feature ?
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A. II

B. III

C. IV

D. I
120. Which of the following is NOT a characteristic feature of allosteric enzymes ?
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A. Give sigmoid shaped curve

B. Presence of Modulator site

C. Follow Michaelis-Menton Kinetics

D. They are multienzyme complex