Which statement is true about DNA in prokaryotic cells versus eukaryotic cells?

Which statement is true about DNA in prokaryotic cells versus eukaryotic cells?

• A. DNA is linear and surrounded by a nuclear envelope.
• B. DNA is circular and located in the nucleoid region without a nucleus.
• C. DNA is circular and located in mitochondria.
• D. DNA is linear and found outside the nucleus.

Answer: (B)

Prokaryotic DNA is typically circular and resides in the nucleoid region without a true nucleus. This reflects their lack of a membrane-bound nucleus, with the DNA looping freely in the cytoplasm. In contrast, eukaryotic DNA is linear and packaged into chromosomes inside a nucleus enclosed by a nuclear envelope. Therefore, the statement that prokaryotic DNA is circular and located in the nucleoid region without a nucleus is the accurate description. The other options describe features like a nuclear envelope, mitochondria, or linear DNA outside a nucleus, which do not apply to prokaryotes.

Prokaryotic DNA is typically circular and resides in the nucleoid region without a true nucleus. This reflects their lack of a membrane-bound nucleus, with the DNA looping freely in the cytoplasm. In contrast, eukaryotic DNA is linear and packaged into chromosomes inside a nucleus enclosed by a nuclear envelope. Therefore, the statement that prokaryotic DNA is circular and located in the nucleoid region without a nucleus is the accurate description. The other options describe features like a nuclear envelope, mitochondria, or linear DNA outside a nucleus, which do not apply to prokaryotes.