Write a short note on nuclear material of prokaryotes.
GeneralClass 12AllAnswered 27 Mar 2026
Answer
In prokaryotic cells:
- Nuclear membrane is absent; genetic material lies in the nucleoid region
- DNA is:
- Circular (not linear)
- Double-stranded
- Not associated with histone proteins (except in some Archaea)
- Equivalent to a single chromosome containing essential genes
- Plasmids: Additional circular DNA molecules carrying non-essential genes (antibiotic resistance, virulence factors)
The nucleoid region appears as a pale-staining area in electron micrographs and is not separated from the cytoplasm by any membrane barrier.
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