biochemistry MCQs – Page 21

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

biochemistry Mcqs

401. Coenzyme A contains which of the following vitamins_______________?
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A. Biotin

B. Pantothenic acid

C. Niacin

D. Pyridoxine

402. Which of the following is not a part of hemoglobin molecule___________?
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A. Vinyl groups

B. Ferric ions

C. Histidine

D. Pyrrole rings

403. Which of the following is not true of Vit D_______________?
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A. Its active form is calcitriol

B. Increase calcium absorption from the intestines

C. Its deficiency results in rickets

D. Its decrease cause phosphate reabsorption from the kidneys

404. Biuret test is confirmatory test for_______________?
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A. Fat

B. None of the above

C. Protein

D. Carbohydrate

405. High content of cholesterol is present in_______________?
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A. Coconut oil

B. Hydrogenated fat

C. Egg yolk

D. Ghee (unsaturated)

406. Colloidal osmotic pressure of plasma is by___________?
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A. Globulin

B. Albumin

C. Fibrinogen

D. Prothrombin

407. Free radicals can be inactivated by the following enzymes EXCEPT__________________?
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A. Glutathione peroxidase

B. Catalase

C. Myeloperoxidase

D. Superoxide dismutase

408. Vitamin K____________?
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A. Inhibition of antithrombin

B. Prevention of capillary fragility

C. Helps in formation of prothrombin

D. Stimulation of hematopoiesis in red bone marrow

409. Thiamine deficiency causes decreased energy production because____________?
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A. It is co-enzyme for transketolase in pentose phosphate pathway

B. It is required for the process of transmination

C. It is co-factor in oxidative reduction

D. It is co-enzyme for pyruvate dehydrogenase

410. Beri-beri is caused due to the deficiency of______________?
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A. Pyridoxine

B. Riboflavin

C. Ascorbic acid

D. Thiamine

411. Mineral present in Vit B12 is_____________?
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A. Iron

B. Cobalt

C. Calcium

D. Selenium

412. Which vitamin is synthesized by intestinal bacteria ?
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A. Vit B

B. Vit A

C. Vit D

D. Vit K

413. The vitamin that facilitates iron absorption____________?
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A. Biotin

B. Para amino benzoic acid

C. Folic acid

D. Ascorbic acid

414. In humans and other primates as well as in guinea pigs, this vitamin cannot be synthesized because of the absence of the enzyme L-gulonolactone oxidase: the vitamin is_____________?
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A. Nicotinic acid

B. Pantothenic acid

C. Folic acid

D. Ascorbic acid

415. The reaction inhibited in thiamine deficiency is_______________?
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A. None of the above

B. Succinyl CoA to fumarate

C. Citrate to alpha ketoglutarate

D. Pyruvate to acetyl CoA

416. Vit-K deficiency is indicated by___________?
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A. None of the above

B. Increased prothrombin time

C. Decreased prothrombin time

D. Low platelet count

417. 1st clinical sign of vitamin A deficiency is_____________?
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A. bitots spots

B. xerostomia

C. conjunctival xeroses

D. night blindness

418. Specific disease caused by vitamin B1 deficiency_______________
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A. Pellagra

B. Megaloblastic anemia

C. Peripheral polyneuritis

D. Angular cheilitis

419. Deficiency of nicotinic acid results in____________?
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A. Beri-beri

B. Pernicious anemia

C. Night blindness

D. Pellagra

420. Vitamin B12 acts as a coenzyme to which one of the following enzyme ?
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A. Homocyteine methyl transferase

B. G-6-P dehydrogenase

C. Glycogen synthase

D. Isocitrate dehydrogenase

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