![]() Gram-negative bacteria do not retain the crystal violet stain and further, it takes the color of the red counterstain in Gram’s method of staining. The teichoic acids are of two types, one is lipoteichoic acid and the other is the teichoic wall acid. Its cell walls additionally having teichoic acids and phosphate. Gram-positive bacteria constitute a cell wall consisting of multiple layers of peptidoglycan. Gram-positive bacteria show the visible violet color upon the application of mordant means iodine and ethanol. Also, some others are the bacterium which causes diphtheria and anthrax. Such bacteria include staphylococci, streptococci, pneumococci. Gram-positive bacteria retain the color of the crystal violet stain in the Gram stain. Also, difference between gram positive and gram negative bacteria will be well presented here. Let us have a detailed look at these two. And it depends upon whether the bacteria take up and retain the crystal violet stain or not. The gram-staining characteristics of bacteria are identified as positive or negative. His method helps to distinguish between different types of bacteria. He used a dye called crystal or gentian violet. Gram has devised a method of staining bacteria. This classification depends upon the staining methods. Bacteria can be classified as gram-positive or gram-negative. ![]() Their structure includes the cell wall, capsule, DNA, pili, flagellum, cytoplasm, and ribosomes. These types of microscopic organisms comprise of a simple physical structure. These are further classified as prokaryotic cells because they are lacking the true nucleus. A bacteria is a large group of minute, unicellular, and microscopic organisms.
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