Which statement about DNA location is accurate for prokaryotes?

Which statement about DNA location is accurate for prokaryotes?

• A. DNA is circular and located in the nucleoid; no nucleus.
• B. DNA is linear and located in the nucleus with membrane-bound organelles.
• C. DNA is circular and located in mitochondria.
• D. DNA is linear and located in the cytoplasm.

Answer: (A)

In prokaryotes, the genetic material is kept in the cytoplasm inside a region called the nucleoid, and the chromosome is typically circular because there is no membrane-bound nucleus to encase the DNA. This differs from eukaryotes, where DNA is linear and housed in a nucleus surrounded by a membrane and, in many cells, other membrane-bound organelles. Prokaryotes also don’t have mitochondria, so DNA isn’t located in such organelles. While DNA is in the cytoplasm, its usual form in prokaryotes is circular rather than linear.

In prokaryotes, the genetic material is kept in the cytoplasm inside a region called the nucleoid, and the chromosome is typically circular because there is no membrane-bound nucleus to encase the DNA. This differs from eukaryotes, where DNA is linear and housed in a nucleus surrounded by a membrane and, in many cells, other membrane-bound organelles. Prokaryotes also don’t have mitochondria, so DNA isn’t located in such organelles. While DNA is in the cytoplasm, its usual form in prokaryotes is circular rather than linear.