Which of the following statements about lac-operon is correct?

(A)Gene i is constitutively expressed
(B)Lactose activates repressor to bind to the operator
(C)Genes i, z, y and a share single common promoter
(D)Galactose can act as an inducer of lac operon

The NCERT line that answers it

Verbatim line

The repressor of the operon is synthesised (all-the-time – constitutively) from the *i* gene.

Chapter: Molecular Basis of Inheritance
Section: 5.8.1 The Lac operon
Page: 22
Words matched: 13 of 13

The answer appears as a continuous sentence in NCERT. This is that sentence.

How this line gives the answer

0, emb=1.0, combined=1.0). Verified: high — The span explicitly states that the repressor is synthesized constitutively from the i gene, which directly confirms option A and distinguishes it from the other options.

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