GK
VITAMINS MINERALS COENZYMES AND DEFICIENCY DISEASES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In the co-enzyme B12 the position occupied by a cyanide ion in vitamin B12 is bonded directly to the ____ of the ribose of adenosine.
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5-6 dimethylbenzimidazole
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hydroxycobalamin
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cyanocobalamin
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adenine
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Explanation:
Detailed explanation-1: -Vitamin B12 occurs in foods that come from animals. Normally, vitamin B12 is readily absorbed in the last part of the small intestine (ileum), which leads to the large intestine. However, to be absorbed, the vitamin must combine with intrinsic factor, a protein produced in the stomach.
Detailed explanation-2: -Vitamin B12 is reduced and converted in the body to two active coenzyme forms, deoxyadenosylcobalamin and methylcobalamin. Deoxyadenosylcobalamin is required for hydrogen transfer and isomerization of methylmalonyl CoA to succinyl Co A. This reaction is involved in both fat and carbohydrate metabolism.
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