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Vitamins and Coenzymes

Vitamins and Coenzymes
Which of these is a vitamin A precursor?

Pyridoxine
Thiamine
Cobalamin
Beta-Carotene

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

antioxidants
reducing agent
oxidizing agent
all of these

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

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

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Vitamins and Coenzymes
Dihydroorotate dehydrogenase contains

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

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Vitamins and Coenzymes
Who discovered vitamin C (ascorbic acid)?

Linus Pauling
Albert Szent-Gyorgyi
Paul Berg
Kerry Mull is

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Vitamins and Coenzymes
The vitamin riboflavin is part of the __________ molecule.

ferredoxin
FAD
pyridoxal phosphat
pyrophosphate

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