Microbiologists use the Gram stain to aid in the identification of bacteria. What is the major difference between Gram-positive and Gram-negative bacteria?
A) structure of nucleotides in the plasma membrane
B) presence or absence of muramic acid in the cell wall
C) presence or absence of peptidoglycan in the cell wall
D) presence or absence of outer plasma membrane

Question

Quizplus · Accepted Answer

The major difference between Gram-positive and Gram-negative bacteria is the presence or absence of an outer plasma membrane. Gram-negative bacteria have an outer membrane that Gram-positive bacteria lack.

Microbiologists Use the Gram Stain to Aid in the Identification