Question

which statement is true about the dna in eukaryotic cells compared to prokaryotic cells?
a. eukaryotic dna is enclosed within a nucleus, while prokaryotic dna is located in the nucleoid region.
b. eukaryotic dna is circular, while prokaryotic dna is linear.
c. eukaryotic dna is single - stranded, while prokaryotic dna is double - stranded.
d. prokaryotic dna is found in membrane - bound organelles, while eukaryotic dna is not.

Explanation:

• Option a: Eukaryotic cells have a nucleus that encloses DNA, while prokaryotic cells have DNA in the nucleoid region (no nucleus). This is a key structural difference.
• Option b: Eukaryotic DNA is linear, and prokaryotic DNA is circular. So this option is incorrect.
• Option c: Both eukaryotic and prokaryotic DNA are double - stranded. So this option is incorrect.
• Option d: Eukaryotic DNA can be found in membrane - bound organelles (e.g., mitochondria, chloroplasts), and prokaryotic cells have no membrane - bound organelles. So this option is incorrect.

Answer:

A. Eukaryotic DNA is enclosed within a nucleus, while prokaryotic DNA is located in the nucleoid region.