In prokaryotes, transcription occurs in the _____.

• A. Nucleus
• B. Mitochondria
• C. Cytoplasm
• D. Cytosol

Answer: (D)

In prokaryotes, transcription happens in the cytoplasm because there is no nucleus to separate transcription from translation. The bacterial DNA sits in the nucleoid region inside the cytoplasm, and RNA polymerase transcribes mRNA there, while ribosomes can begin translating the mRNA right away. Since prokaryotes lack membrane-bound organelles, the cytoplasm is essentially the same space as the cytosol—the fluid inside the cell. So transcription occurs in that cytosolic environment.

The other options don’t fit for this organism type: a nucleus is a membrane-bound compartment found in many eukaryotes, where transcription occurs; mitochondria are organelles in eukaryotic cells with their own transcription; while the cytoplasm is a correct general term, in this context the specific fluid component inside the cell that carries out transcription is the cytosol, which aligns with prokaryotic cellular organization.