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Vitamins and Coenzymes

Vitamins and Coenzymes
Vitamin-C is considered as a

water soluble
none of these
fat soluble
fat and water soluble

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Vitamins and Coenzymes
Which of the following are reduced coenzymes?

NADH and FADH2
Coenzyme A and ubiquinone
NAD+ and FAD
ATP and GTP

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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
Selenium is an essential component of the enzyme glutathione peroxidase which

scavenges toxic hydoperoxycompounds in tissues
reduces toxic hydoperoxycompounds in tissues
oxidizes toxic hydoperoxycompounds in tissues
None of these

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

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Vitamins and Coenzymes
The absence of ascorbic acid in the human diet gives rise to

beri-beri
rickets
cataract
pernicious anemia

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