Question

what will happen if rna polymerase fails to attach to the promoter?
○ translation will begin early.
○ transcription will not begin.
○ rna polymerase will unwind dna strands.
○ an mrna strand will be made before translation begins.

Explanation:

RNA polymerase attaches to the promoter to start transcription (the process of making RNA from DNA). If it fails to attach, transcription can't initiate. Translation is protein synthesis (not directly related to promoter - RNA polymerase binding here), unwinding DNA is part of transcription initiation which needs promoter binding, and mRNA is made during transcription (so no mRNA if transcription doesn't start). So the correct option is the one stating transcription won't begin.

Answer:

B. Transcription will not begin.