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Viruses are no more 'alive' than isolated chromosomes because:

1. both require the environment of a cell to replicate
2. they require both RNA and DNA
3. they both need food molecules
4. they both require oxygen for respiration

Correct answer: both require the environment of a cell to replicate

Solution

Viruses cannot reproduce independently; they must enter a host cell and use its machinery to make new viral particles. Isolated chromosomes also cannot replicate by themselves and need the cellular environment and enzymes of a cell.

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