Which of the following statements about bacterial cell walls is incorrect?

• A. They can be found outside of the cell membrane.
• B. Both gram-positive and gram-negative cell walls have peptidoglycan
• C. The cell wall of gram-positive bacteria is more complex than that of gram-negative bacteria.
• D. The gram-negative bacterial cell wall has an outer membrane outside of the peptidoglycan layers.

Answer: (C)