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Vitamins and Coenzymes

Vitamins and Coenzymes
Vitamin-C is considered as a

fat soluble
none of these
fat and water soluble
water soluble

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

hydrofolic acid
tetrahydrofolic acid
trihydrofolic acid
dihydrofolic acid

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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
form chelation
stabilize the semiquinone

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Vitamins and Coenzymes
Main function of insulin hormone is to

decrease blood sugar
increase blood sugar
decrease glycogen in liver
increase glycogen in liver

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

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

ferredoxin
FAD
pyrophosphate
pyridoxal phosphat

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