Which of the statements regarding gram staining is wrong?

(A) Mycobacterium tuberculosis stains blue because of the thick lipid layer

(B) Streptococcus pyogenes stains blue because of a thick peptidoglycan layer

(C) Escherichia coli stains pink because of a thin peptidoglycan layer

(D) Mycoplasma pneumoniae is not visible in the Gram’s stain because it has no cell wall


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