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Vitamins and Coenzymes

Vitamins and Coenzymes
A deficiency of Vitamin K results in a decreased level of

thrombin
prothrombin
fibrinogen
fibrin

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

de-stabilize the semiquinone
form chelation
all of these
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-biotinyl-L-lysine
ε-N-lipoyl - L-lysine
ε-N-lysine moiety

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

Beta-Carotene
Cobalamin
Pyridoxine
Thiamine

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Vitamins and Coenzymes
Dihydroorotate dehydrogenase contains

2 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
4 flavins and 4 atoms of iron per molecule

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Vitamins and Coenzymes
A deficiency of thiamin produces the disease known as

anemia
scurvy
beri-beri
cataract

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