drugs

• some antiviral drugs e.g. reverse transcriptase inhibitors inhibit the enzyme reverse transcriptase,

  which catalyses the replication of viral DNA this prevents the virus from replicating
• some antibiotics e.g. penicillin inhibits the enzyme transpeptidase, which catalyses the formation of proteins in bacterial cell walls.

  weakens the cell and prevents the bacterium from regulating its osmotic pressure.

  cell bursts and bacterium is killed