Question

question 9 of 10
which sentence describes a way gene expression in eukaryotes is regulated after transcription but before translation begins?
a. chemical changes can prevent or alter polypeptide combinations.
b. changes to histones uncoil chromatin in different areas to expose different genes.
c. each gene has its own promoter that is recognized by specific transcription factors.
d. coding regions of mrna can be clipped and reassembled in multiple possible combinations.

Explanation:

• Option A: Chemical changes affecting polypeptide combinations occur after translation (post - translational regulation), not in the post - transcription/pre - translation stage.
• Option B: Changes to histones (chromatin remodeling) occur before transcription. It is a part of transcriptional regulation (e.g., making genes accessible for transcription).
• Option C: Promoter recognition by transcription factors is a step in transcription initiation, not in the post - transcription/pre - translation phase.
• Option D: mRNA splicing (clipping and reassembling coding regions of mRNA) occurs after transcription (mRNA is already made) and before translation (the mature mRNA is used for translation).

Answer:

D. Coding regions of mRNA can be clipped and reassembled in multiple possible combinations.