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What are gram positive bacteria?And distinguish between gram positive and gram negative bacteria.

Answer» In bacteriology, gram-positive bacteria are bacteria that give a positive result in the Gram stain test, which is traditionally used to quickly classify bacteria into two broad categories according to their type of cell wall.\tGram-Positive bacteriaGram-Negative bacteriaCell WallA single-layered, smooth cell wall\xa0A double-layered,\xa0wavy cell-wallCell Wall thicknessThe thickness of the cell wall is 20 to 80 nanometresThe thickness of the cell wall is 8 to 10 nanometresPeptidoglycan LayerIt is a thick layer/ also can be multilayeredIt is a thin layer/ often single-layered.Teichoic acidsPresence of teichoic acidsAbsence of teichoic acidsOuter membraneThe outer membrane is absentThe outer membrane is present (mostly)PorinsAbsentOccurs in Outer MembraneMesosomeIt is more prominent.It is less prominent.MorphologyCocci or spore-forming rodsNon-spore forming rods.Flagella StructureTwo rings in basal bodyFour rings in basal bodyLipid contentVery low20 to 30%LipopolysaccharideAbsentPresentToxin ProducedExotoxinsEndotoxins or ExotoxinsResistance to AntibioticMore susceptibleMore resistantExamplesStaphylococcus, Streptococcus, etc.Escherichia, Salmonella, etc.Gram Staining\xa0These bacteria retain the crystal violet colour even after they are washed with acetone or alcohol and appear as purple-coloured when examined under the microscope after gram staining.These bacteria do not retain the stain colour even after they are washed with acetone or alcohol and appear as pink-coloured when examined under the microscope after gram staining.\t


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