A: Some bacteria are Gram-negative.R: Gram-ne | vedclass

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(A) Gram staining is a technique used to differentiate bacteria into two groups: Gram-positive and Gram-negative.Gram-positive bacteria retain the cry

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$A$ and $R$ are both true and $R$ is the correct explanation of $A$.

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(A) Gram staining is a technique used to differentiate bacteria into two groups: Gram-positive and Gram-negative.Gram-positive bacteria retain the crystal violet stain (appearing purple),while Gram-negative bacteria do not retain the crystal violet stain when washed with alcohol or acetone,and instead take up the counterstain (safranin),appearing pink or red.This difference is due to the structure of the cell wall; Gram-negative bacteria have a thinner peptidoglycan layer and an outer lipopolysaccharide membrane that prevents the retention of the primary stain.Therefore,both the assertion $(A)$ and the reason $(R)$ are true,and the reason correctly explains why some bacteria are classified as Gram-negative.

$A$: Some bacteria are Gram-negative.
$R$: Gram-negative bacteria do not retain the Gram stain.

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$A$: Some bacteria are Gram-negative.$R$: Gram-negative bacteria do not retain the Gram stain.