As gram positive bacteria lack an outer lipid membrane, when correctly referring to their structure rather than staining properties, are termed monoderms. The outer lipid membrane possessed by gram ...

Gram-positive bacteria have thicker cell walls that retain the purple color from Gram stain, which can quickly differentiate cell types based on the width of their cell walls.

This means that gram-negative bacteria can be harder to treat than gram-positive bacteria. This type of bacteria gets its name from the gram stain test.

A bacteria can either be Gram-negative or Gram-positive. These terms come from the Gram-staining test developed by Hans Christian Gram in 1884, which involves applying a purple stain to bacteria.

Bacteria with a thick cell wall remain purple and are called Gram-positive. Bacteria with a thinner cell wall, on the other hand, do not retain the stain and are called Gram-negative.

Treatment of Gram-Positive Bacilli Gram-positive bacilli infections are treated with antibiotics. Penicillin, cloxacillin, and erythromycin treat over 90% of gram-positive bacteria.

Gram-positive and gram-negative bacteria differ in the composition of their cell walls. Gram-negative bacteria have a double layer of protection, making them more difficult to kill, Muñoz said.