Question

Which step in transcription occurs first?

A gene is expressed through protein production.

RNA polymerase attaches to the promoter.

mRNA moves the code from the nucleus to the ribosome for protein production.

A repressor protein must attach to the operator.

Answer 1

RNA polymerase attaches to the promoter.

Explanation: Binding of RNA polymerase to the promoter is the first step in transcription (initiation). Repressor binding would block transcription, mRNA export and translation occur after transcription, and protein production is the final outcome.