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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
What metal ion is specifically bound by vitamin B12?

Copper
Cobalt
Zinc
Iron

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Vitamins and Coenzymes
Lipoic acid exists in

oxidized form
oxidized and reduced form both
none of these
reduced form

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Vitamins and Coenzymes
What compound of raw egg white causes a syndrome similar to vitamin B deficiency?

Betabindin
Avidin
Albumin
Ovalbumin

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Vitamins and Coenzymes
In one iron-metalloflavoprotein, the iron is present as a

flavin moiety
heme-protein
both (a) and (b)
nonheme type

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

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

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