Mycoplasma differs from most other bacteria in that it
Correct answer: C. lacks a cell wall
- A. contains no DNA
- B. possesses 80S ribosomes
- C. lacks a cell wall
- D. is multicellular
Explanation
Mycoplasma is the smallest known self-living organism and has no cell wall, which is why antibiotics that attack wall synthesis, such as penicillin, have no effect on it. It remains fully prokaryotic, with 70S ribosomes and a single circular chromosome.
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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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