Ch.20 vocab

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Across
  1. 4. virus protein coat
  2. 5. viruses that infect bacteria
  3. 6. agents that cause disease
  4. 7. the cycle of viral infection,replication,and cell destruction
Down
  1. 1. segments of nucleic acids contained in a protein coat
  2. 2. membranelike layer that covers the capsids of some viruses
  3. 3. proteins with attached carbohydrate molecules