Check your understanding of concepts from 13·16–13·19 Viruses are at the border between living and non-living by answering the following questions.
1. Many biologists do not consider viruses to be alive. Which of the following characteristics of viruses lead to this ambiguity?
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2. Which of the following components are always absent in a virus?
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3. Which of the following is the correct step-by-step description of the most basic viral replication cycle?
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4. Which of the following is NOT a correct statement about the human immunodeficiency virus (HIV)?
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5. A virus that can infect a bacterium should also be able to infect:
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