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The hereditary material present in the bacterium Escherichia coli is

1. single stranded DNA
2. deoxyribose sugar
3. double stranded DNA
4. single stranded RNA

Correct answer: double stranded DNA

Solution

Escherichia coli is a bacterium, and bacteria store their hereditary information mainly in a circular chromosome made of double-stranded DNA. Single-stranded RNA is typical of some viruses, and deoxyribose is only a sugar component, not the full genetic material.

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