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Vitamins and Coenzymes

Vitamins and Coenzymes
An enzyme, L-folate reductase reduces folic acid to

hydrofolic acid
trihydrofolic acid
tetrahydrofolic acid
dihydrofolic acid

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Vitamins and Coenzymes
The symptoms of retinol excess are

bone fragility
all of these
weakness
nausea

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Vitamins and Coenzymes
A fat-soluble vitamin that regulates blood clotting is

niacin
vitamin A
vitamin K
vitamin C

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Vitamins and Coenzymes
Ascorbic acid acts as an

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

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Vitamins and Coenzymes
Dihydroorotate dehydrogenase contains

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

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

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

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