Which structure is commonly present in bacteria but absent from animal cells?
Correct answer: A. Plasmid
- A. Plasmid
- B. Plasma membrane
- C. Ribosomes
- D. Cytoplasm
Explanation
Plasmids are small circular DNA molecules that carry extra genes, often for antibiotic resistance, and are widely used as vectors in genetic engineering. Animal cells share the plasma membrane, ribosomes and cytoplasm with bacteria, so only the plasmid separates them.
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About Animal and Plant Cell
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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