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Vitamins and Coenzymes

Vitamins and Coenzymes
An example of a digestive hormone is

pepsin
gastrin
lipase
amylase

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Vitamins and Coenzymes
Which of these is a vitamin A precursor?

Beta-Carotene
Thiamine
Pyridoxine
Cobalamin

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

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

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

micro-organisms
animals
fishes
plants

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Vitamins and Coenzymes
In one iron-metalloflavoprotein, the iron is present as a

nonheme type
both (a) and (b)
heme-protein
flavin moiety

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MORE MCQ ON Vitamins and Coenzymes

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