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Vitamins and Coenzymes

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

ferredoxin
FAD
pyridoxal phosphat
pyrophosphate

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Vitamins and Coenzymes
Vitamin B12 is useful in the prevention and treatment of

scurvy
beri-beri
cataract
pernicious anemia

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

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

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

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Vitamins and Coenzymes
Vitamin B12 (Cobalamin) is only synthesized by

animals
micro-organisms
plants
fishes

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