A Mixture of S

question 16

Multiple Choice

A mixture of S.aureus and the enteric bacteria E.coli was placed onto the skin of the fingertips of a volunteer.The volunteer immediately touched one of their inoculated fingertips to nutrient agar plate #1 and then waited 30 minutes and touched a different inoculated finger to nutrient agar plate #2.After incubating the plates overnight, what pattern of growth would you expect to see on the plates?

• A)Both E.coli and S.aureus grew on both plates.
• B)Plate #1 grew both, whereas plate #2 grew only S.aureus.
• C)Plate #1 grew both, whereas plate #2 grew only E.coli.
• D)Plate #1 grew only S.aureus, whereas plate #2 grew both.
• E)Plate #1 grew only E.coli, whereas plate #2 grew both.