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Vitamins and Coenzymes

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

animal
none of these
plants and animals both
plants

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

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

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Vitamins and Coenzymes
Which of these molecules is vitamin H?

Folic acid
None of these
Biotin
Carnitine

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

FAD
ferredoxin
pyrophosphate
pyridoxal phosphat

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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
A deficiency of Vitamin K results in a decreased level of

thrombin
fibrin
fibrinogen
prothrombin

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