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Vitamins and Coenzymes

Vitamins and Coenzymes
The prosthetic group biotin is a carrier of which type of molecule?

Ammonia
Methyl group
Sulfhydryl group
Activated carbon dioxide (CO2)

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Vitamins and Coenzymes
Lipoic acid exists in

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

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

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

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

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

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Vitamins and Coenzymes
Which of these hormones is a catecholamine?

Tetrahydrofolate
Tetraiodothyronine
Follitropin
Norepinephrine

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

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

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