A) in the absence of corepressor
B) in the presence of corepressor
C) in the presence of apressor
D) all of the above
Correct Answer: A
Solution :
Some enzymes normally present in cell but their synthesis is ceased when the concentration of their end product become high, such enzymes are called repressible enzymes whereas the end product is called corepressor. A regulator gene produces the aporepressor which unites with corepressor to form a functional represser molecule. This represser molecule inhibit m-RNA synthesis by all genes specifying enzymes.
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