Final answer:
Gram-negative bacteria have an outer membrane and a thin cell wall made of peptidoglycan. They do not stain purple in the Gram stain.
Step-by-step explanation:
Gram-negative bacteria have an outer membrane, which is one of the characteristics that differentiate them from gram-positive bacteria. The outer membrane of gram-negative bacteria contains lipopolysaccharides and lipoproteins. This outer membrane provides an additional layer of protection and makes gram-negative bacteria more resistant to antibiotics.
Gram-negative bacteria have a thin cell wall composed of peptidoglycan, whereas gram-positive bacteria have a thick cell wall made of peptidoglycan. In the Gram stain, gram-negative bacteria stain pink or red, not purple like gram-positive bacteria.
Therefore, the false statement about gram-negative cell walls is C. They do not stain purple in the Gram stain.