NCERT Biology Class 12, Chapter 5

Mutation and gene expression NEET Biology MCQ

Last updated: July 30, 2026

Reviewed by MedQGo Editorial Team | Last updated: July 30, 2026

In prokaryotic gene expression regulation, which of the following correctly represents the products of regulatory genes in negative and positive transcriptional control systems?

Arepressor, repressor

Brepressor, activator

Cactivator, repressor

Dactivator, activator

Correct answer: B. repressor, activator

In prokaryotes, regulatory genes in negative and positive transcriptional control systems produce repressors and activators respectively.

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