Question

question 12 of 25
what is one way gene expression is regulated after translation has occurred?
a. transcription factors determine whether dna is transcribed.
b. changes to histones determine how chromatin is coiled.
c. the cell controls where ribosomes assemble on the mrna strand.
d. chemical changes determine whether polypeptides combine or are broken down.

Explanation:

• Option A: Transcription factors act during transcription (before translation), not after.
• Option B: Changes to histones affect chromatin coiling which is related to transcription (not post - translation).
• Option C: Ribosome assembly on mRNA is part of the translation process, not post - translation.
• Option D: After translation, polypeptides can be modified by chemical changes (e.g., phosphorylation, ubiquitination). These changes can determine if polypeptides combine to form functional proteins or are broken down. This is a post - translational regulation mechanism.

Answer:

D. Chemical changes determine whether polypeptides combine or are broken down.