Penicillins kill bacteria by?

[Stacey w]

A. destroying DNA
B. stopping protein production
C. inhibiting cell wall production
D. killing host cells

[ladypam]

C. inhibiting cell wall production.

Penicillin acts on the protein that synthesis the cell walls, thus inhibiting its action.

[mokmok69]

Penicillin kills bacteria by interfering with the ability to synthesize cell wall. In this sequence, Escherichia coli were incubated in penicillin for 30 minutes. The bacteria lengthen, but cannot divide.