Where is DNA found in a prokaryotic cell?

Where is DNA found in a prokaryotic cell?

• A. Free floating in the cytoplasm, and some may be in a plasmid
• B. In a nucleus
• C. In mitochondria
• D. In chloroplasts

Answer: (A)

In prokaryotic cells, there is no membrane-bound nucleus, so DNA resides in the cytoplasm. The main bacterial chromosome is typically a single circular molecule located in the nucleoid region, and many prokaryotes also carry small circular DNA pieces called plasmids that float freely in the cytoplasm. Mitochondria and chloroplasts, which contain their own DNA, are organelles found in eukaryotic cells—not in prokaryotes—so they don’t apply here. So the most accurate description is DNA that is free in the cytoplasm, with the potential of also being carried by plasmids.

In prokaryotic cells, there is no membrane-bound nucleus, so DNA resides in the cytoplasm. The main bacterial chromosome is typically a single circular molecule located in the nucleoid region, and many prokaryotes also carry small circular DNA pieces called plasmids that float freely in the cytoplasm. Mitochondria and chloroplasts, which contain their own DNA, are organelles found in eukaryotic cells—not in prokaryotes—so they don’t apply here. So the most accurate description is DNA that is free in the cytoplasm, with the potential of also being carried by plasmids.