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Vitamins and Coenzymes

Vitamins and Coenzymes
The vitamin niacin is part of the __________ molecule.

pyrophosphate
ferredoxin
pyridoxal phosphate
NAD+

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

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

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

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

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

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

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Vitamins and Coenzymes
Ascorbic acid acts as an

oxidizing agent
None of these
oxidizing and reducing agent both
reducing agent

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Vitamins and Coenzymes
Main function of insulin hormone is to

increase blood sugar
decrease glycogen in liver
increase glycogen in liver
decrease blood sugar

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