Read the following statements regarding the lac operon in E. coli: A. Glucose or galactose cannot act as inducers for the lac operon. B. Regulation of the lac operon by the repressor is referred to as positive regulation. C. The y gene codes for permease, which increases the permeability of the cell to -galactosides. D. The repressor of the operon is synthesized from the i gene only in the presence of lactose. How ma

Step-by-step solution

Statement A is correct: NCERT explicitly states that glucose or galactose cannot act as inducers for the lac operon; only lactose or allolactose can. Statement B is incorrect: Regulation of the lac operon by the repressor is referred to as negative regulation, because the repressor protein turns off the operon. Statement C is correct: The y gene codes for permease, an enzyme that increases the permeability of the cell to -galactosides (lactose). Statement D is incorrect: The repressor protein is synthesised constit