The genetic material of a typical bacterium is
Correct answer: D. a single circular DNA molecule lying in the nucleoid
- A. a linear molecule wrapped around histones
- B. distributed over many chromosomes
- C. enclosed inside a nuclear envelope
- D. a single circular DNA molecule lying in the nucleoid
Explanation
The bacterial chromosome is one circular DNA molecule condensed into a nucleoid region, with no membrane around it and no histone packaging. Histones and multiple linear chromosomes belong to 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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