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Vitamins and Coenzymes

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

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

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Vitamins and Coenzymes
A deficiency of Vitamin K results in a decreased level of

thrombin
fibrin
fibrinogen
prothrombin

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Vitamins and Coenzymes
Ascorbic acid acts as an

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

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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
form chelation
de-stabilize the semiquinone

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

cataract
rickets
pernicious anemia
beri-beri

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Vitamins and Coenzymes
An early sign of retinol deficiencies in man is

keratinization
night blindness
xeropthalmia
none of these

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