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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plants
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fishes
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animals
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micro-organisms
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Detailed explanation-1: -B12 is synthesized by only certain bacteria and archaeon, but not by plants or animals. The synthesized B12 is transferred and accumulated in animal tissues, even in certain plant tissues via microbial interaction. Meats and milks of herbivorous ruminant animals are good sources of B12 for humans.
Detailed explanation-2: -Vitamin B12 or cobalamin is a vitamin that can only be synthesized by microorganisms which in humans are localized in the colon where B12 cannot be taken up by the organism. Thus, cobalamin has to be taken up by the food and only animal derived food delivers sufficient amounts.
Detailed explanation-3: -Vitamin B-12 is synthesized and utilized by bacteria in the human gut microbiome and is required for over a dozen enzymes in bacteria, compared to only 2 in humans. However, the impact of vitamin B-12 on the gut microbiome has not been established.