Which statement best describes the difference between transcriptional regulation and translational regulation?

Which statement best describes the difference between transcriptional regulation and translational regulation?

• A. Transcriptional regulation affects ribosome scanning.
• B. Transcriptional regulation controls mRNA synthesis (e.g., transcription factors binding promoter).
• C. Translational regulation sequesters mRNA in nucleus.
• D. Translational regulation controls mRNA transcription rate.

Answer: (B)

The difference being tested is where regulation acts in gene expression. Transcriptional regulation determines whether a gene is copied into mRNA in the first place, by controlling transcription initiation—often through transcription factors binding to promoter regions to recruit RNA polymerase and modulate mRNA production. This is the best description because it captures the idea that transcriptional control sets the amount of mRNA available for subsequent steps. The other ideas mix in later steps: ribosome scanning is a process of translation, not transcription; sequestering mRNA in the nucleus isn’t a feature of translational control (translation happens after mRNA exits the nucleus); and translational regulation does not control how much mRNA is produced at the transcriptional level.

The difference being tested is where regulation acts in gene expression. Transcriptional regulation determines whether a gene is copied into mRNA in the first place, by controlling transcription initiation—often through transcription factors binding to promoter regions to recruit RNA polymerase and modulate mRNA production.

This is the best description because it captures the idea that transcriptional control sets the amount of mRNA available for subsequent steps. The other ideas mix in later steps: ribosome scanning is a process of translation, not transcription; sequestering mRNA in the nucleus isn’t a feature of translational control (translation happens after mRNA exits the nucleus); and translational regulation does not control how much mRNA is produced at the transcriptional level.