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Vitamins and Coenzymes

Vitamins and Coenzymes
Which of these is a vitamin A precursor?

Beta-Carotene
Pyridoxine
Thiamine
Cobalamin

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

fishes
animals
micro-organisms
plants

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Vitamins and Coenzymes
Models of end-linked Osaka VI Fibrinogen dimers, a bilayer dimer is linked at

both ends by one disulfide bond
either end via a single disulfide bond
either end via two disulfide bonds
both ends by two disulfide bonds

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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.

cyanocobalamin
hydroxycobalamin
adenine
5-6 dimethylbenzimidazole

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Vitamins and Coenzymes
Vitamin B12 is useful in the prevention and treatment of

cataract
scurvy
pernicious anemia
beri-beri

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Vitamins and Coenzymes
The occurrence of metals such as iron or molybdenum in some flavoproteins can

stabilize the semiquinone
all of these
de-stabilize the semiquinone
form chelation

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