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Vitamins and Coenzymes

Vitamins and Coenzymes
Which of the following are reduced coenzymes?

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

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

plants
plants and animals both
none of these
animal

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Vitamins and Coenzymes
In the co-enzyme B12the position occupied by a cyanide ion in vitamin B12 is bonded directly to the __________ of the ribose of adenosine.

hydroxycobalamin
adenine
cyanocobalamin
5-6 dimethylbenzimidazole

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Vitamins and Coenzymes
Dihydroorotate dehydrogenase contains

2 flavins and 4 atoms of iron per molecule
2 flavins and 2 atoms of iron per molecule
4 flavins and 2 atoms of iron per molecule
4 flavins and 4 atoms of iron per molecule

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

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

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Vitamins and Coenzymes
An example of a digestive hormone is

amylase
gastrin
lipase
pepsin

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