Cobalamin is synthesized by most organisms from simple precursors and does not need to be in the diet.

Name: Cobalamin is synthesized by most organisms from simple precursors and does not need to be in the diet.
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Quizplus · Accepted Answer

Cobalamin, also known as vitamin B12, cannot be synthesized by most organisms from simple precursors and must be obtained from the diet or supplements. It is only synthesized by certain bacteria and archaea.

Cobalamin Is Synthesized by Most Organisms from Simple Precursors and Does