Question

Which of the following is the necessary condition for the entry of lactose into the cell?

(a) High level expression of lac operon

(b) Low level expression of lac operon

(c) Absence of lac operon in the cell

(d) Absence of proteins in the cell

The question was asked in exam.

The doubt is from Molecular Basis of Inheritance topic in section Molecular Basis of Inheritance of Biology – Class 12

Answer 1

Correct option is (b) Low level expression of lac operon

To explain: The action of the enzyme protease helps lactose to enter into the cell. But this can be achieved only if a low-level expression of the lac operon is present inside the cell. Otherwise, lactose cannot enter the cell.