Question

during transcription, what happens to the rna polymerase if a repressor protein attaches to the operator?
it begins transcription.
it begins translation.
it cannot attach to enzyme 1.
it cannot attach to the promoter.

Explanation:

In prokaryotic gene regulation (like the operon model), when a repressor protein binds to the operator, it blocks RNA polymerase from attaching to the promoter. Transcription starts when RNA polymerase binds to the promoter. Translation is a different process (protein synthesis, not related here). The repressor - operator interaction doesn't involve enzyme 1 attachment. So the correct reasoning leads to the option about RNA polymerase not attaching to the promoter.

Answer:

D. It cannot attach to the promoter (assuming the options are labeled A - D as per the order: 1. It begins transcription. 2. It begins translation. 3. It cannot attach to enzyme 1. 4. It cannot attach to the promoter)