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Vitamins and Coenzymes

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

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

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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
adenine
5-6 dimethylbenzimidazole
cyanocobalamin

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Vitamins and Coenzymes
Biotin occurs mainly in combined forms bound to protein through

ε-N-lipoyl - L-lysine
ε-N-biotinyl-L-lysine
ε-N-lysine moiety
ε-S-lysine moiety

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Vitamins and Coenzymes
Selenium is an essential component of the enzyme glutathione peroxidase which

None of these
reduces toxic hydoperoxycompounds in tissues
scavenges toxic hydoperoxycompounds in tissues
oxidizes toxic hydoperoxycompounds in tissues

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Vitamins and Coenzymes
An example of a digestive hormone is

gastrin
amylase
lipase
pepsin

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Vitamins and Coenzymes
Which of the following are reduced coenzymes?

NADH and FADH2
ATP and GTP
Coenzyme A and ubiquinone
NAD+ and FAD

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