Which of the following is NOT a characteristic of prokaryotic cells?
Correct answer: C. Presence of histone proteins
- A. Absence of membrane-bound nucleus
- B. Presence of 70S ribosomes
- C. Presence of histone proteins
- D. Circular DNA
Explanation
Prokaryotes lack histone proteins. Their DNA is not organized into nucleosomes with histones, unlike eukaryotes.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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