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Vitamins and Coenzymes

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

vitamin K
vitamin A
vitamin C
niacin

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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
cyanocobalamin
adenine

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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
Vitamin K1 was first isolated from alfalalfa and has the phytyl side chain consisting of

six isoprene units
four isoprene units
nine isoprene units
four isoprene units

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Vitamins and Coenzymes
The absence of ascorbic acid in the human diet gives rise to

beri-beri
cataract
rickets
pernicious anemia

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Vitamins and Coenzymes
Which of these molecules is vitamin H?

Folic acid
Biotin
None of these
Carnitine

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