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Vitamins and Coenzymes

Vitamins and Coenzymes
The absence of ascorbic acid in the human diet gives rise to

rickets
beri-beri
pernicious anemia
cataract

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

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

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

fishes
micro-organisms
animals
plants

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

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

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

prothrombin
fibrin
fibrinogen
thrombin

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

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

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