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Vitamins and Coenzymes

Vitamins and Coenzymes
Lipoic acid exists in

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

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Vitamins and Coenzymes
Which of these hormones is a catecholamine?

Tetraiodothyronine
Follitropin
Tetrahydrofolate
Norepinephrine

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

vitamin K
vitamin C
vitamin A
niacin

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Vitamins and Coenzymes
The vitamin niacin is part of the __________ molecule.

pyrophosphate
pyridoxal phosphate
NAD+
ferredoxin

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

Cobalamin
Thiamine
Pyridoxine
Beta-Carotene

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

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

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