Read the following statements regarding the lac operon.
A. Lactose is the substrate for the enzyme beta- galactosidase and it regulates switching on and off of the operon.
B. The repressor of the operon is synthesised constitutively from the z gene.
C. In the presence of the inducer, the repressor is activated by interaction with it.
D. Regulation of lac operon by repressor is referred to as negative regulation.
E. The y gene codes for transacetylase.
In the light of above statements choose the correct answer from the options given below:
Lactose is the substrate for the enzyme betagalactosidase and it regulates switching on and off of the lac operon. Hence, it is termed as inducer. The repressor of the operon is synthesised (all-thetime – constitutively) from the i gene. In the presence of an inducer, such as lactose or allolactose, the repressor is inactivated by interaction with the inducer. Regulation of lac operon by repressor is referred to as negative regulation.
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