Notes

Outline

Bacterial Resistance How does resistance to antibiotics develop?

Important ideas you need to know (1) Bacteria only have one copy of each gene Changes in the genotype will show in a changed phenotype So it only needs one change or mutation to allow it to breakdown the penicillin

Important ideas you need to know (2) Penicillin breaks down the bacterial cell wall so sensitive bacteria  die Resistant bacteria produce the enzyme penicillinase which breaks down penicillin

Watch the animation Penicillin has been added to the bacterial culture The slides show what is happening to the numbers of different types of bacteria Which type increases?

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The  End Don’t forget that it is the presence of the antibiotic that allows the resistant type of bacteria to grow