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TEAS ScienceNot quite alive

VirusesATI TEAS 7 cheat sheet

Not quite alive

8 key facts 3 practice questions Reviewed Oct 2026
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Structure

  • Genetic material (DNA or RNA) inside a protein capsid
  • Some have a lipid envelope
  • No cytoplasm, no organelles, no metabolism

Replication

  • Must hijack a host cell — cannot reproduce alone
  • Attach → enter → copy → assemble → release

Treatment

  • Antibiotics do not work on viruses
  • Antivirals and vaccines are the tools

Examples

  • Influenza, HIV, hepatitis, measles, COVID-19
Key takeaway

Not quite alive

Before you read

Test yourself first: 3 questions

Question 1 of 3

A pathogen that causes the common cold is a:

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