Repressible enzymes are formed ________________.

In the absence of corepressor

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In the presence of corepressor

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In the presence of apressor

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All of the above

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Solution

The correct option is A In the absence of corepressor
The enzymes and their synthesis are ceased when the concentration of their product becomes high. Such enzymes are called repressible enzymes and the end product is called as a corepressor. Whereas aporepressor is produced by regulator gene which unites with corepressor to form a functional repressor molecule. This repressor molecule inhibits mRNA synthesis by all genes specifying enzymes.

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