Question

which of these events occurs first during the process of transcription?
a. rna polymerase joins nucleotides into the rna molecule.
b. rna polymerase binds to the promoter.
c. introns are removed from the rna molecule.
d. exons are removed from the rna molecule.

Explanation:

Transcription starts with the initiation phase, where RNA polymerase first recognizes and binds to the promoter region of a gene. Option A happens after binding (elongation phase). Options C and D are part of RNA processing, which occurs after transcription is completed.

Answer:

B. RNA polymerase binds to the promoter.