Question

Repressible enzyme are formed

• A. in the absence of corepressor
• B. in the presence of corepressor
• C. in the pressence of apressor
• D. All of the above

Answer 1

Answer: (A)

Some enzymes are normally present in cell but their synthesis is ceased when the concentration of their and product become high. Such enzymes are called repressive enzymes, whereas the end product is. called corepressor. A regulator gene produces the aporepressor, while unites with corepressor to form a functional represser molecule, This represser molecule inhibit $ mRNA $ synthesis by all genes specifying enzymes.