PG entrance exam CUET PG 2025 Mock Test Life Sciences Fundamental Processes Control of gene expression
In a bacterial cell, a mutation occurs in the lac operon promoter region, causing a complete loss of RNA polymerase binding. How will this mutation affect the expression of the lac operon in the presence of lactose?
1
The lac operon will be constitutively expressed.
2
The lac operon will not be expressed at all.
3
The lac operon will only express lacZ.
4
The lac operon will express all genes except lacY.