Each of the following statements concerning the Gram stain is correct except

Q. Each of the following statements concerning the Gram stain is correct except:

1. Mycobacterium tuberculosis stains blue because it has a thick lipid layer
2. Escherichia coli stains pink because it has a thin peptidoglycan layer
3. Streptococcus pyogens stains blue because it has a thick peptidoglycan layer
4. Mycoplasma pneumoniae is not visible in the Gram’s stain because it does not have a cell wall

Answer: Mycobacterium tuberculosis stains blue because it has a thick lipid layer