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In prokaryotes nucleoid consist of double stranded circular DNA without histone protein.

1. These are archaebacteria which can tolerate high temperature.
2. Transfer of genetic information from one bacterium to another by physical contact is called conjugation while if it takes place by some other medium like virus than it is called transduction.
3. In (E.coli) double stranded DNA is present.
4. E. coli is a Gram-negative, facultative anaerobic, rod-shaped, coliform bacterium of the genus Escherichia that is commonly found in the lower intestine of warm-blooded organisms. Most types of E. coli are harmless and even help keep your digestive tract healthy. But some strains can cause diarrhea if you eat contaminated food or drink fouled water.

Correct answer: In (E.coli) double stranded DNA is present.

Solution

The nucleoid in prokaryotes contains a double-stranded circular DNA molecule, and E. coli is a prokaryote. So the statement that double-stranded DNA is present in E. coli correctly matches the given fact.

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