When Alexander Fleming created penicillin, how did it destroy bacteria?

Question: When Alexander Fleming created penicillin, how did it destroy bacteria?
- Keywords:
  bacteria,
  destruction,
  fleming,
  penicillin
Asked by jamesat79 to Steve on 20 Jun 2013.
- Steven Gardner answered on 20 Jun 2013:
  
  I had to look it up but apparently penicillin works by destroying the cell wall of a bacterium when it tries to divide.

jamesat79 commented on 20 Jun 2013:

Thanks! Medicines are very cool! Underneath the skin are lots of things happening which lots of us don’t know about!
Cheers!
Jamesat79

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Question: When Alexander Fleming created penicillin, how did it destroy bacteria?