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Penicillin is an antibiotic used to treat Gram-positive bacterial infections. Penicillin stops Gram
-positive bacteria from dividing . Figure 4 shows Gram-negative and Gram-positive bacteria
growing on two separate nutrient agar plates. There is a disc of penicillin in the centre of each
agar plate. Discuss why penicillin prevents the growth of Gram-positive bacteria but not Gram-
negative bacteria. Your answer should refer to differences in the cell walls of the two types of
bacteria.
(6 Points)