Q. Which of the statements regarding gram staining is wrong?
- Mycobacterium tuberculosis stains blue because of the thick lipid layer
- Streptococcus pyogenes stains blue because of a thick peptidoglycan layer
- Escherichia coli stains pink because of a thin peptidoglycan layer
- Mycoplasma pneumoniae is not visible in the Gram’s stain because it has no cell wall
Answer: Mycobacterium tuberculosis stains blue because of the thick lipid layer
