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Vitamins and Coenzymes

Vitamins and Coenzymes
Lipoic acid exists in

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

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Vitamins and Coenzymes
Lipoic acid is a co-factor of the

both (a) and (b)
pyruvic dehydrogenase
di-hydroorotate dehydrogenase
α-ketoglutaric dehydrogenase

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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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Vitamins and Coenzymes
β-carotene together with α-carotene, γ-carotene and cryptoxanthine are synthesized by

animal
plants
none of these
plants and animals both

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Vitamins and Coenzymes
Vitamins are essential because the organism

can't synthesize these compounds in the adequate amounts
None of these
can't synthesize these compounds at all
can synthesize these compounds partially

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

pyrophosphate
pyridoxal phosphat
FAD
ferredoxin

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