Which statement best describes prokaryotes?

Which statement best describes prokaryotes?

• A. Microorganisms that lack membrane-bound organelles and have no nucleus
• B. They have mitochondria and a nucleus
• C. They produce spores only
• D. They contain circular DNA only

Answer: (A)

Prokaryotes are organisms that lack a nucleus and any membrane-bound organelles. Their genetic material is not enclosed by a nuclear membrane; it sits in the cytoplasm in a region called the nucleoid and is typically a single circular chromosome, often with small circular plasmids. They do not have mitochondria or chloroplasts, and energy production occurs without these organelles. This combination of features—no nucleus and no membrane-bound organelles—is the defining description. Statements that claim a nucleus or mitochondria are present, or that spores are produced exclusively, miss the core characteristics, and noting circular DNA ignores the presence of plasmids and possible organizational variations.

Prokaryotes are organisms that lack a nucleus and any membrane-bound organelles. Their genetic material is not enclosed by a nuclear membrane; it sits in the cytoplasm in a region called the nucleoid and is typically a single circular chromosome, often with small circular plasmids. They do not have mitochondria or chloroplasts, and energy production occurs without these organelles. This combination of features—no nucleus and no membrane-bound organelles—is the defining description. Statements that claim a nucleus or mitochondria are present, or that spores are produced exclusively, miss the core characteristics, and noting circular DNA ignores the presence of plasmids and possible organizational variations.