Vitamins Questions Set 1

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Biochemistry (Vitamins Set 1)

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1. β-Carotene, precursor of vitamin A, is
oxidatively cleaved by :

A) β-Carotene dioxygenase

B) Oxygenase

C) Hydroxylase

D) Transferase

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2. The normal serum concentration of 1,25- dihydroxycholecalciferol in pg/ml is :

A) 26–65

B) 1–5

C) 5–20

D) 80–100

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3. Fat soluble vitamins are :

A) Soluble in alcohol

B) one or more Propene units

C) Stored in liver

D) All these

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4. The normal serum concentration of vitamin A in mg/100 ml is :

A) 5–10

B) 100–150

C) 15–60

D) 0–5

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5. A poor source of Vitamin D is:

A) Egg

B) Butter

C) Milk

D) Liver

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6. On exposure to light rhodopsin forms :

A) All trans-retina

B) Cis-retinal

C) Retinol

D) Retinoic acid

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7. Deficiency of Vitamin A causes :

A) Xeropthalmia

B) Hypoprothrombinemia

C) Megaloblastic anemia

D) Pernicious anemia

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8. Lumirhodopsin is stable only at temperature below :

A) –10°C

B) –20°C

C) –40°C

D) –50°C

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9. Retinoic acid participates in the synthesis of :

A) Iodopsin

B) Rhodopsin

C) Glycoprotein

D) Cardiolipin

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10. An important function of vitamin A is :

A) To act as coenzyme for a few enzymes

B) To play an integral role in protein synthesis

C) To prevent hemorrhages

D) To maintain the integrity of epithelial tissue

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11. Richest source of Vitamin D is :

A) Fish liver oils

B) Margarine

C) Egg yolk

D) Butter

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12. Retinal is a component of :

A) Iodopsin

B) Rhodopsin

C) Cardiolipin

D) Glycoproteins

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13. Vitamins are :

A) Accessory food factor

B) Generally synthesized in the body

C) Produced in endocrine glands

D) Proteins in nature

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14. Vitamin A or retinal is a :

A) Steroid

B) Polyisoprenoid compound containing a cyclohexenyl ring

C) Benzoquinone derivative

D) 6-Hydroxychromane

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15. The normal serum concentration of 25-hydroxycholecalciferol in ng/ml is :

A) 0–8

B) 60–100

C) 100–150

D) 8–55

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16. Vitamin D absorption is increased in:

A) Acid pH of intestine

B) Alkaline pH of intestine

C) Impaired fat absorption

D) Contents of diet

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17. The international unit of vitamin A is
equivalent to the activity caused by :

A) 0.3 µg of Vitamin A alcohol

B) 0.344 µg of Vitamin A alcoho

C) 0.6 µg of Vitamin A alcohol

D) 1.0 µg of Vitamin A alcohol

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18. Retinal is reduced to retinol in intestinal mucosa by a specific retinaldehyde reductase utilising :

A) NADPH + H+

B) FAD

C) NAD

D) NADH + H+

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19. One manifestation of vitamin A deficiency is :

A) Painful joints

B) Night blindness

C) Loss of hair

D) Thickening of long bones

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20. Preformed Vitamin A is supplied by

A) Milk, fat and liver

B) All yellow vegetable

C) All yellow Fruits

D) Leafy green vegetables

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21. Carr-Price reaction is used to detect :

A) Vitamin A

B) Vitamin D

C) Ascorbic acid

D) Vitamin E

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22. Retinol is transported in blood bound to :

A) α2-Globulin

B) Aporetinol binding protein

C) β-Globulin

D) Albumin

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23. Retinol and retinal are interconverted requiring dehydrogenase or reductase in the presence of :

A) NAD or NADP

B) NADH + H+

C) NADPH

D) FAD

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24. The most potent Vitamin D metabolite is :

A) 25-Hydroxycholecalciferol

B) 1,25-Dihydroxycholecalciferol

C) 24, 25-Dihydroxycholecalciferol

D) 7-Dehydrocholestero

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25. The normal serum concentration of 24,25- dihydroxycholecalciferol in ng/ml is :

A) 8–20

B) 25–50

C) 1–5

D) 60–100

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Vitamins Questions Set 1

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