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Vitamins and Coenzymes

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

trihydrofolic acid
dihydrofolic acid
hydrofolic acid
tetrahydrofolic acid

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

beri-beri
cataract
rickets
pernicious anemia

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Vitamins and Coenzymes
Models of end-linked Osaka VI Fibrinogen dimers, a bilayer dimer is linked at

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

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

none of these
plants and animals both
animal
plants

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

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

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Vitamins and Coenzymes
The reductant, NADH, transfers the electrons via a flavo-proteins to the specific disulfide (S-S) protein to form a dithiol (SH,SH) protein which converts vitamin

B12(Co+)to B12(Co2+)
B12(Co) to B12(Co2+)
B12(Co2+)to B12(Co)
B12(Co2+)to B12(Co+)

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