Biology 9700 · AS & A Level · Mode of action of enzymes

Mode of action of enzymes — practice question

Which statement could describe how resistance to penicillin develops in bacteria?

  • AA mutation of a bacterial gene prevents penicillin from binding to DNA in bacterial cells, which allows DNA replication to continue.
  • BA mutation of a bacterial gene causes penicillin to bind less readily to certain proteins, which allows bacteria to continue producing cell walls.
  • CA mutation of a bacterial gene allows the production of an enzyme that breaks down penicillin, which allows the ribosomes to continue functioning.
  • DA mutation of a bacterial gene changes the tertiary structure of an enzyme that penicillin inhibits, which allows bacteria to continue producing cell membranes.

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