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Question

Vitamins with some enzymes act as
  1. Coenzyme
  2. Apoenzyme
  3. Holoenzyme
  4. Cofactor

A
Coenzyme
B
Apoenzyme
C
Holoenzyme
D
Cofactor
Solution
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Vitamins with some enzymes act as coenzyme. Coenzymes are organic molecules that are required by certain enzymes to carry out catalysis. They bind to the active site of the enzyme and participate in catalysis but are not considered substrates of the reaction.
An apoenzyme is an inactive enzyme, activation of the enzyme occurs upon binding of an organic or inorganic cofactor.
Holoenzyme: An apoenzyme together with its cofactor. A holoenzyme is complete and catalytically active.
A cofactor is a non-protein chemical compound that is required for the protein's biological activity. These proteins are commonly enzymes, and cofactors can be considered "helper molecules" that assist in biochemical transformations.
Therefore, the correct answer is option A.

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