Which statement best differentiates transcriptional regulation from translational regulation?

Which statement best differentiates transcriptional regulation from translational regulation?

• A. Transcriptional regulation controls RNA production; translational regulation controls translation efficiency and timing.
• B. Transcriptional regulation controls RNA production; translational regulation controls RNA splicing.
• C. Transcriptional regulation occurs after translation; translational regulation occurs before transcription.
• D. Transcriptional regulation controls RNA production; translational regulation controls translation efficiency and timing.

Answer: (D)

Transcriptional regulation acts at the step where DNA is turned into RNA, so it determines how much RNA is produced in the first place. Translational regulation acts after the RNA is made, controlling how efficiently that RNA is used to synthesize protein and when the translation happens. So the best way to distinguish them is: transcriptional regulation controls RNA production; translational regulation controls translation efficiency and timing. The other ideas don’t fit: splicing is a processing step before translation and isn’t controlled by translational regulators, and the notion that transcriptional regulation occurs after translation (or vice versa) misplaces the sequence of events in gene expression.

Transcriptional regulation acts at the step where DNA is turned into RNA, so it determines how much RNA is produced in the first place. Translational regulation acts after the RNA is made, controlling how efficiently that RNA is used to synthesize protein and when the translation happens. So the best way to distinguish them is: transcriptional regulation controls RNA production; translational regulation controls translation efficiency and timing. The other ideas don’t fit: splicing is a processing step before translation and isn’t controlled by translational regulators, and the notion that transcriptional regulation occurs after translation (or vice versa) misplaces the sequence of events in gene expression.