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Gram-positive and gram-negative bacteria are two types of bacteria that differ in their cell wall composition and staining. Gram-positive bacteria have a thick layer of peptidoglycan with teichoic acid that retains the purple color of crystal violet during the Gram staining process. Gram-negative baRead more
Gram-positive and gram-negative bacteria are two types of bacteria that differ in their cell wall composition and staining. Gram-positive bacteria have a thick layer of peptidoglycan with teichoic acid that retains the purple color of crystal violet during the Gram staining process. Gram-negative bacteria have a thin layer of peptidoglycan and an outer membrane with lipopolysaccharide that loses the purple color and stains red or pink during the Gram-staining process.
Gram-negative bacteria are generally more resistant to antibodies and antibiotics than gram-positive bacteria because their outer membrane is impenetrable.
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