What is difference between Gram Positive and Gram Negative Bacteria ?

Question

What is difference between Gram Positive and Gram Negative Bacteria ?

Answer 1

Gram-positive bacteria are those that are stained dark blue or violet by Gram staining. This is in contrast to Gram-negative bacteria, which cannot retain the crystal violet stain, instead taking up the counterstain (safranin) and appearing red or pink. Gram-positive organisms are able to retain the crystal violet stain because of the high amount of peptidoglycan in the cell wall. Gram-positive cell walls typically lack the outer membrane found in Gram-negative bacteria.

Answer 2

Gram positive bacteria have a high proportion of peptidoglycan in the cell wall. Gram negative bacteria do not. In Gram staining, it's the peptidoglycan that holds the dye making gram positive cells stain darker.

Answer 3

gram positive bacteria have certain glycoproteins on their cell surface while gram negative bacteria don't. this affects properties like how they should be stained in microscopy or how drugs can be used to kill them