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Vitamins and Coenzymes

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

none of these
xeropthalmia
keratinization
night blindness

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Vitamins and Coenzymes
Vitamin-D deficiency can cause

rickets
cataract
beri-beri
pernicious anemia

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

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

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

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

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

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

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

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

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