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For what reason is penicillin lethal to bacteria yet essentially non-toxic for mammalian cells?
a. High population density of host cells neutralize its
effect
b. Mammalian cells are impermeable to penicillin
c. Mammalian cells inactivate penicillin
d. Penicillin does not affect cells with long generation
time
e. Target site is unique to bacteria.

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