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Vitamins and Coenzymes

Vitamins and Coenzymes
A fat-soluble vitamin that regulates blood clotting is

vitamin K
niacin
vitamin C
vitamin A

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Vitamins and Coenzymes
Vitamin B12 (Cobalamin) is only synthesized by

animals
micro-organisms
plants
fishes

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Vitamins and Coenzymes
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

B12(Co+)to B12(Co2+)
B12(Co2+)to B12(Co+)
B12(Co) to B12(Co2+)
B12(Co2+)to B12(Co)

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Vitamins and Coenzymes
The disease Beriberi is due to a dietary deficiency in

vitamin B2 (riboflavin)
vitamin B12
vitamin B1 (thiamine)
vitamin B6 (pyridoxine)

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

hydroxycobalamin
5-6 dimethylbenzimidazole
adenine
cyanocobalamin

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Vitamins and Coenzymes
Which of these hormones is a catecholamine?

Follitropin
Tetrahydrofolate
Tetraiodothyronine
Norepinephrine

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MORE MCQ ON Vitamins and Coenzymes

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