Question 26
2 pts
how penicillin was discovered
in 1928, sir alexander fleming was studying staphylococcus bacteria growing in culture dishes.
he noticed that a mold called penicillium was also growing in some of the dishes. a clear area
existed around the mold because all the bacteria that had grown in this area had died. in the
culture dishes without the mold, no clear areas were present.
fleming hypothesized that the mold must be producing a chemical that biled the bacteria. he
decided to isolate this substance and test it to see if it would kill bactería. fleming transferred the
mold to a nutrient broth solution. this solution contained all the materials the mold needed to
grow. after the mold grew, he removed it from the nutrient broth. fleming then added the nutrient
broth in which the mold had grown to a culture of bacteria. he observed that the bacteria died.
which of the following should be his claim?
the mod, penicillium, wills the staphylococcus bacteria
the mois, penicillium, did not have any affect on the staphylococcus bacteria
he cannot make a daim based on his results,
sir alexander fleming should be carefully playing with bacteria