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Question

Assertion :Coenzymes serve as co-factors in a number of different enzyme catalyzed reactions. Reason: Coenzymes and prosthetic groups are cofactors.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
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C
Assertion is correct but Reason is incorrect.
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D
Both Assertion and Reason are incorrect.
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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Cofactors can be metals or coenzymes, and their primary function is to assist in enzyme activity. They are able to assist in performing certain, necessary, reactions the enzyme cannot perform alone. They are divided into coenzymes and prosthetic group. A holoenzyme refers to a catalytically active enzyme that consists of both apoenzyme (enzyme without its cofactor(s)) and cofactor. There are two groups of cofactors are metals and small organic molecules called coenzymes. Coenzymes are small organic molecules usually obtained from vitamins. Prosthetic groups refer to tightly bound coenzymes, while cosubstrates refer to loosely bound coenzymes that are released in the same way as substrates and products. Loosely bound coenzymes differ from substrates in that the same coenzymes may be used by different enzymes in order to bring about proper enzyme activity.
So, the correct option is B.

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