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Vitamins and Coenzymes

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

Copper
Zinc
Iron
Cobalt

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

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

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Vitamins and Coenzymes
The symptoms of retinol excess are

bone fragility
weakness
all of these
nausea

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Vitamins and Coenzymes
Main function of insulin hormone is to

increase glycogen in liver
increase blood sugar
decrease glycogen in liver
decrease blood sugar

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Vitamins and Coenzymes
β-carotene together with α-carotene, γ-carotene and cryptoxanthine are synthesized by

plants and animals both
animal
none of these
plants

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Vitamins and Coenzymes
Vitamins are essential because the organism

can't synthesize these compounds at all
can't synthesize these compounds in the adequate amounts
can synthesize these compounds partially
None of these

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