How does transcription in bacteria differ from eukaryotic transcription in terms of location and RNA processing?

• A. In bacteria, transcription occurs in the cytoplasm and mRNA is not extensively processed; translation can begin before transcription ends.
• B. In bacteria, transcription occurs in the nucleus and mRNA is not processed.
• C. In bacteria, transcription occurs in mitochondria and translation occurs after RNA export.
• D. In bacteria, transcription occurs in the cytoplasm; mRNA requires splicing before translation.

Answer: (A)

The main idea is that bacteria handle transcription and RNA processing differently from eukaryotes because there is no nucleus to separate the two processes. In bacteria, transcription occurs in the cytoplasm and the mRNA produced is used almost immediately for translation, so the mRNA is not extensively processed. Ribosomes can begin translating the nascent mRNA even while it’s still being transcribed, a phenomenon known as coupled transcription-translation. This contrasts with eukaryotes, where transcription happens in the nucleus and the initial RNA transcript (pre-mRNA) must undergo processing—capping, polyadenylation, and splicing—before the mature mRNA is exported to the cytoplasm for translation. The option that states transcription occurs in the cytoplasm, mRNA is not heavily processed, and translation can begin before transcription ends captures this fundamental difference.