With reference to enzymes, which one of the following statements is true?
A
Apoenzyme = Holoenzyme + Coenzyme
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B
Holoenzyme = Apoenzyme + Coenzyme
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C
Coenzyme = Apoenzyme + Holoenzyme
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D
Holoenzyme = Coenzyme− Apoenzyme
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Solution
The correct option is D Holoenzyme = Apoenzyme + Coenzyme Holoenzyme is the active form of the enzyme. It is made of 2 components called the apoenzyme and coenzyme. A cofactor can also be a called as a coenzyme if it is an organic molecule. The apoprotein itself is inactive. On binding with the cofactor, it gets activated resulting in the formation of a holoenzyme that is functional. Thus the correct answer is option B.