Question

Which step in transcription occurs first?
mRNA moves the code from the nucleus to the ribosome for protein production.
A gene is expressed through protein production.
RNA polymerase attaches to the promoter.
A repressor protein must attach to the operator.

Answer 1

RNA polymerase attaches to the promoter.

This is the first step of transcription (initiation). mRNA export to ribosomes and protein production happen later; a repressor binding the operator is a regulatory event that would block transcription rather than being an initial transcription step.