Question

Assume that:
• you are provided with a 10% solution of the antibiotic, penicillin, that is produced by this
fungus
• you have some Petri dishes containing a culture medium on which bacteria are growing,
forming a cloudy layer
• when the bacteria are killed by the penicillin a clear area shows on the plate
• the usual laboratory instruments are also available.

Make an outline plan of an investigation to determine the minimum concentration of this
penicillin needed to kill the bacteria.