21. Gram psotive bacteria contains a tick peptidoglycan layer and an outer membrane.
a) True
b) False
Gram positive bacteria give a positive result in Gram staining test. This test is used to classify the bacteria into two different categories on the basis of their cell wall. These bacteria take up the crystal violet dye used in Gram staining test and then appear purple colored through an optical microscope.
They take up crystal violet stain because they have thick peptidoglycan layer in their cell wall that retains the stain after the decolorization stage of Gram staining. Gram positive bacteria have a thick cell wall that contains several peptidoglycan layers but they don't have the outer membrane envelope which is found in Gram negative bacteria.
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