What is the Difference Between Gram Positive and Gram Negative Bacteria?
Written by Jason Williams, B.S.
The main difference between gram negative and gram positive bacteria has to do with the arrangement of the outer portions of the cell.
The two illustrations that follow represent cross-sections of the cell wall and cell membrane of gram positive bacteria and gram negative bacteria, respectively.
Gram Positive Bacterium
Gram Negative Bacterium
- What is a Minimum Inhibitory Concentration Assay?
- What is a Zone of Inhibition Assay?
- What is a Bacterial Endospore?
These diagrams are for educational purposes only, and may not be used elsewhere without written permission from Antimicrobial Test Laboratories.
Viewers of this page may also be interested in these educational pages: