The bacteriologist sir alexander fleming was engage in the study of staphyococcus a kind of bacteria that wa being grown in petri dishes . that's when he noticed the peniciin mold that was aso growing in some culture dishes. there was a clear area around the penicilin . sir alexander hypothesised that the penicillin mold could be producing a chemical that kills bacteria. o he decided to test his hypothesis by isolating the chemical and testing it to see if it would really kill bacteria . he transferred it to a solution of nutrient broth that contained the elements necessary to it's growth . once the mold flourished , he removed it from the broth and transferred the broth to a culture of bacteria. the bacteria died as a result. this discovery was used to develop several kinds of antibiotics that treated several deadly diseases. what is the problem here ? what is the hypothesis?