biochemistry MCQs – Page 9

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

421. Active form of vitamin D in kidney is_____________?
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A. 25 hydroxy cholecalciferol

B. 1 dihydroxy cholecalciferol

C. 7 dihydroxy calciferol

D. 1,25 dihydroxy cholecalciferol
422. The mineral having sparing action on Vitamin E_______________?
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A. Selenium

B. Iron

C. Iodine

D. Chromium

423. Rhodopsin deficiency is chiefly associated with________________?
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A. Vitamin D deficiency

B. Vitamin A deficiency

C. Scurvy

D. Rickets

424. Fast soluble vitamins are_____________?
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A. A, B, E, K

B. A, B , D, K

C. A, D. E, K

D. A, C, E, K

425. The function of vitamin A is/are related to which of the following ?
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A. Retinol

B. Retinoic acid

C. All of the above

D. Retinal

426. Of prime importance in the structure of flavoproteins is____________?
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A. Vit A

B. Vit B1

C. Vit B2

D. Vit B6

427. A patient with chronic renal failure and bone pains will have deficiency of which vitamin_____________?
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A. Vitamin B

B. Vitamin A

C. Vitamin D

D. Vitamin C

428. Vitamin A_____________?
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A. Is water soluble

B. Is required for formation of clotting factors

C. Maintains normal plasma calcium levels

D. Deficiency causes impaired vision
429. One molecule of B-carotene gives rise to______________?
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A. 3 unit of Vitamin A

B. 4 unit of Vitamin A

C. 1 unit of Vitamin A

D. 2 unit of Vitamin A
430. Deficiency of vitamin A causes the following except_____________?
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A. Myopia

B. Corneal dryness

C. Night blindness

D. Bitots spots

431. Malonyl aciduria is seen in deficiency of_____________?
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A. Pyridoxine

B. Folic acid

C. B12

D. Riboflavin

432. Biological activity of tocopherols has been attributed, in part to their actions as_____________?
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A. Anticoagulants

B. Provitamin

C. Antidotes for selenium poisoning

D. Antioxidant

433. Vitamin K dependent clotting factors are______________?
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A. IX

B. II

C. X

D. All of the above

E. VII

434. Vitamin K antagonizes_____________?
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A. Corticosteroids

B. Bishydroxy coumarin

C. Production of clotting factors by liver

D. Thrombin formation

435. Which vitamin is the most indispensable during mitosis______________?
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A. Pantothenic acid

B. Aspartic acid

C. Ascorbic acid

D. Folic acid
436. Vitamin D_____________?
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A. Along with PTH, increases calcium resorption from bone

B. Deficiency on adults leads to rickets

C. Synthesis is regulated at the reaction catalyzed by 15-hydroxylase

D. Absorption requires bile pigments

437. Two Vitamin whose derivatives are involved in transformation of serine to glycine are_____________?
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A. Folic acid and B12

B. Folic acid and B6

C. B6 ad B12

D. B12 and nicotinamie

438. Absorption of vitamin K requires normal absorption of_________________?
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A. Calcium

B. Amino acids

C. Fat

D. Glucose

439. The maximum content of vitamin E is found in____________?
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A. Wheat germ oil

B. Cold liver oil

C. Fish liver oil

D. Liver

440. The 3 Ds dermatitis, diarrhoea and dementia are seen in deficiency of____________?
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A. Riboflavin

B. Thiamin

C. Pyridoxine

D. Niacin
441. Daily Vitamin A intake___________?
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A. 1000 I.U

B. 3000 I.U

C. 4000 I.U

D. 2000 I.U

442. Coenzyme forms are correctly matched except_____________?
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A. Vitamin B ATP

B. Vitamin B2 FMN+FAC

C. Biotin carboxylated biotin

D. Niacin NAD+NADP

443. In vitamin A deficiency, patient complains of all of the following except___________?
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A. Night blindness

B. Keratosis

C. Xerophthalmia

D. Phophoric calciuria
444. Vitamin also acting as hormones________________?
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A. Vitamin D

B. Vitamin C

C. Vitamin B1

D. Vitamin A

445. Deficiency of vitamin C causes the following except____________?
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A. Abnormal Collagen

B. Diarrhoea

C. Anaemia

D. Painful swollen gums

446. Vit B12 is absorbed in the_____________?
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A. Stomach

B. Proximal ileum

C. Terminal ileum

D. Lower jejunum

447. Scurvy is the result of deficiency of____________?
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A. Vitamin C

B. Vitamin D

C. Vitamin A

D. Vitamin B

448. Deficiency of which vitamin causes glossitis dementia roughed keratotic areas on skin and gastrointestinal symptoms ?
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A. Pyridoxine

B. Riboflavin

C. Pantothenic acid

D. Niacin