Hereditary material of Escherichia coli is

Single stranded DNA

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Double stranded DNA

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Single stranded RNA

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Double stranded RNA

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Solution

The correct option is B Double stranded DNA
Escherichia coli is a prokaryotic organism. It lacks membrane-bound organelles like mitochondria and Golgi apparatus. It also lacks a true nucleus. Instead, it has nucleoid, genetic material without a nuclear envelope. The hereditary material present in it is double-stranded circular DNA.
Thus, the correct answer is 'Double-stranded DNA.'

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