Question

In prokaryotic but not eukaryotic cells, a precedes the genes of an operon.

• A. lactose molecule
• B. promoter
• C. operator
• D. both (b) and (c)

Answer 1

The correct option is D both (b) and (c)

Operons are regions of DNA that contain clusters of related genes. They are made up of a promoter region, an operator, and multiple related genes. The promoter is located before genes. The operator can be located either within the promoter or between the promoter and the genes. RNA polymerase initiates transcription by binding to the promoter region. The location of the operator is important as its regulation either allows or prevents transcription of the genes into mRNA.

So, the correct option is 'both (b) and (c)'.