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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
What compound of raw egg white causes a syndrome similar to vitamin B deficiency?

Betabindin
Ovalbumin
Albumin
Avidin

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Vitamins and Coenzymes
Biotin occurs mainly in combined forms bound to protein through

ε-N-biotinyl-L-lysine
ε-N-lipoyl - L-lysine
ε-S-lysine moiety
ε-N-lysine moiety

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Vitamins and Coenzymes
Which of these molecules is vitamin H?

Folic acid
Carnitine
None of these
Biotin

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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
Vitamin K1 was first isolated from alfalalfa and has the phytyl side chain consisting of

four isoprene units
nine isoprene units
six isoprene units
four isoprene units

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