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Vitamins and Coenzymes

Vitamins and Coenzymes
Which of the following compounds/(s) belong/(s) to the vitamin B6 group?

All of these
Pyridoxine
Pyridoxal
Pyridoxamine

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Vitamins and Coenzymes
Vitamin B12 is useful in the prevention and treatment of

beri-beri
pernicious anemia
scurvy
cataract

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Vitamins and Coenzymes
The occurrence of metals such as iron or molybdenum in some flavoproteins can

stabilize the semiquinone
all of these
form chelation
de-stabilize the semiquinone

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Vitamins and Coenzymes
Biotin occurs mainly in combined forms bound to protein through

ε-S-lysine moiety
ε-N-lysine moiety
ε-N-biotinyl-L-lysine
ε-N-lipoyl - L-lysine

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Vitamins and Coenzymes
Selenium is an essential component of the enzyme glutathione peroxidase which

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

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Vitamins and Coenzymes
The most prominent role that tocopherol has in in-vitro systems is as a strong

antioxidants
all of these
oxidizing agent
reducing agent

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