Gram-Positive and Gram-Negative Bacteria Are Most Commonly Differentiated in the Laboratory

Gram-positive and Gram-negative bacteria are most commonly differentiated in the laboratory by whether__________.

A) penicillin can kill them or not
B) a dye is trapped within the cells during the Gram staining procedure
C) the bacteria are collected from the outside or the inside of an infected patient
D) water can flow into the bacteria,causing them to burst
E) the bacteria contain peptidoglycan