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Vitamins and Coenzymes

Vitamins and Coenzymes
Which of the following compounds/(s) belong/(s) to the vitamin B6 group?

Pyridoxal
Pyridoxine
All of these
Pyridoxamine

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Vitamins and Coenzymes
Lipoic acid exists in

oxidized and reduced form both
none of these
reduced form
oxidized form

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

fibrinogen
prothrombin
thrombin
fibrin

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Vitamins and Coenzymes
An enzyme, L-folate reductase reduces folic acid to

trihydrofolic acid
dihydrofolic acid
tetrahydrofolic acid
hydrofolic acid

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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.

adenine
5-6 dimethylbenzimidazole
cyanocobalamin
hydroxycobalamin

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

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

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