An amino sugar called N-acetylmuramic acid is an important building block of the cell wall of some bacteria.Penicillin prevents this amino sugar from being incorporated into the bacterial cell wall.Based on this information,select all the of the following statements that are true.

A)Penicillin affects bacteria but not eukaryotic animal cells.
B)Bacterial cells that had already formed their cell walls would be unaffected.
C)Penicillin would stop the growth of active colonies of susceptible bacteria.
D)Penicillin affects bacterial cell walls and eukaryotic plant cell walls.