Biochemistry - Vitamins and Coenzymes

Exercise :: Vitamins and Coenzymes - Section 1

  • Vitamins and Coenzymes - Section 1
11. 

Lipoic acid exists in

A. oxidized form
B. reduced form
C. oxidized and reduced form both
D. none of these

Answer: Option C

Explanation:

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12. 

Vitamin B12 is useful in the prevention and treatment of

A. pernicious anemia
B. scurvy
C. cataract
D. beri-beri

Answer: Option A

Explanation:

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13. 

An example of a digestive hormone is

A. lipase
B. pepsin
C. amylase
D. gastrin

Answer: Option D

Explanation:

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14. 

In the co-enzyme B12the position occupied by a cyanide ion in vitamin B12 is bonded directly to the __________ of the ribose of adenosine.

A. adenine
B. 5-6 dimethylbenzimidazole
C. hydroxycobalamin
D. cyanocobalamin

Answer: Option A

Explanation:

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15. 

The reductant, NADH, transfers the electrons via a flavo-proteins to the specific disulfide (S-S) protein to form a dithiol (SH,SH) protein which converts vitamin

A. B12(Co2+)to B12(Co)
B. B12(Co) to B12(Co2+)
C. B12(Co2+)to B12(Co+)
D. B12(Co+)to B12(Co2+)

Answer: Option C

Explanation:

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