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Vitamins and Coenzymes

Vitamins and Coenzymes
What metal ion is specifically bound by vitamin B12?

Cobalt
Iron
Zinc
Copper

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

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

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

all of these
oxidizing agent
antioxidants
reducing agent

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Vitamins and Coenzymes
The prosthetic group biotin is a carrier of which type of molecule?

Sulfhydryl group
Activated carbon dioxide (CO2)
Methyl group
Ammonia

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

All of these
Pyridoxal
Pyridoxine
Pyridoxamine

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

plants
animals
fishes
micro-organisms

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