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Vitamins and Coenzymes

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

fishes
plants
micro-organisms
animals

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Vitamins and Coenzymes
An early sign of retinol deficiencies in man is

xeropthalmia
keratinization
night blindness
none of these

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Vitamins and Coenzymes
Which of these is a symptom of vitamin A deficiency?

Impaired blood clotting
Impaired taste perception
Blindness
Osteoporosis

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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
The vitamin niacin is part of the __________ molecule.

ferredoxin
pyrophosphate
NAD+
pyridoxal phosphate

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

pyridoxal phosphat
ferredoxin
FAD
pyrophosphate

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