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Vitamins and Coenzymes

Vitamins and Coenzymes
Which of these is a vitamin A precursor?

Pyridoxine
Beta-Carotene
Thiamine
Cobalamin

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Vitamins and Coenzymes
Which of the following are reduced coenzymes?

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

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

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

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

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Vitamins and Coenzymes
Dihydroorotate dehydrogenase contains

4 flavins and 2 atoms of iron per molecule
2 flavins and 2 atoms of iron per molecule
2 flavins and 4 atoms of iron per molecule
4 flavins and 4 atoms of iron per molecule

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

cataract
beri-beri
rickets
pernicious anemia

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