Vitamins Questions Set 2

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Biochemistry (Vitamins Set 2)

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1. One international unit (I.U) of vitamin D
is defined as the biological activity of :

A) 0.025 µg of cholecalcifero

B) 0.025 µg of 7-dehydrocholecalciferol

C) 0.025 µg of ergosterol

D) 0.025 µg of ergocalciferol

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2. The activity of tocopherols is destroyed by :

A) Commercial cooking

B) Reduction

C) Conjugation

D) All of these

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3. Calcitriol synthesis involves :

A) Both liver and kidney

B) Intestine

C) Adipose tissue

D) Muscle

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4. Function of Vitamin A :

A) Healing epithelial tissues

B) Protein synthesis regulation

C) Cell growth

D) All of these

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5. Vitamin synthesized by bacterial in the intestine is :

A) A

B) C

C) D

D) K

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6. Deficiency of vitamin D causes :

A) Ricket and osteomalacia

B) Tuberculosis of bone

C) Hypthyroidism

D) Skin cancer

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7. The β-ring of 7-dehydrocholesterol is
cleaved to form cholecalciferol by :

A) Infrared light

B) Dim light

C) Ultraviolet irridation with sunlight

D) Light of the tube lights

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8. In the individuals who are given liberal
quantities of vitamin C, the serum ascorbic acid level is :

A) 1–1.4 µg/100 ml

B) 2–4 µg/100 ml

C) 1–10 µg/100 ml

D) 10–20 µg/100 ml

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9. Vitamin K is involved in posttranslational
modification of the blood clotting factors
by acting as cofactor for the enzyme :

A) Carboxylase

B) Decarboxylase

C) Hydroxylase

D) Oxidase

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10. Vitamin K is found in :

A) Green leafy plants

B) Meat

C) Milk

D) Fish

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11. Vitamin E reduces the requirement of :

A) Iron

B) Zinc

C) Selenium

D) Magnesium

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12. All the following conditions produce a real or functional deficiency of vitamin K except :

A) Prolonged oral, broad spectrum antibiotic therapy

B) Total lack of red meat in the diet

C) The total lack of green leafy vegetables in the diet

D) Being a new born infant

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13. Dicoumarol is antagonist to :

A) Riboflavin

B) Retinol

C) Menadione

D) Tocopherol

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14. Insignificant amount of Vitamin E is present in :

A) Wheat germ oil

B) Sunflower seed oil

C) Safflower seed oil

D) Fish liver oil

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15. Creatinuria is caused due to the deficiency of vitamin :

A) A

B) K

C) E

D) D

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16. Tocopherols prevent the oxidation of :

A) Vitamin A

B) Vitamin D

C) Vitamin C

D) Vitamin K

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17. Vitamin K2 was originally isolated from :

A) Soyabean

B) Wheat gram

C) Alfalfa

D) Putrid fish meal

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18. Hypervitaminosis K in neonates may cause :

A) Porphyria

B) Jaundice

C) Pellagra

D) Prolonged bleeding

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19. The most important natural antioxidant is :

A) Vitamin D

B) Vitamin E

C) Vitamin B12

D) Vitamin K

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20. Vitamin K is a cofactor for :

A) Gamma carboxylation of glutamic acid residue

B) β-Oxidation of fatty acid

C) Formation of γ-amino butyrate

D) Synthesis of tryptophan

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21. The vitamin required for the formation of hydroxyproline (in collagen) is :

A) Vitamin C

B) Vitamin A

C) Vitamin D

D) Vitamin E

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22. In human body highest concentration of ascorbic acid is found in :

A) Liver

B) Adrenal cortex

C) Adrenal medulla

D) Spleen

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23. Vitamin required for the conversion of phydroxyphenylpyruvate to homogentisate is :

A) Folacin

B) Cobalamin

C) Ascorbic acid

D) Niacin

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24. The vitamin which would most likely become deficient in an individual who develop a completely carnivorous life style is :

A) Thiamin

B) Niacin

C) Vitamin C

D) Cobalamin

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25. The requirement of vitamin E is increased with greater intake of :

A) Carbohydrates

B) Proteins

C) Polyunsaturated fat

D) Saturated fat

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Vitamins Questions Set 2

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