How does the thickness of peptidoglycan layers differ between gram-positive and gram-negative bacteria?

• A. Gram-positive bacteria have a thin peptidoglycan layer.
• B. Gram-negative bacteria have a thick peptidoglycan layer.
• C. Gram-positive bacteria have a thick peptidoglycan layer, while gram-negative bacteria have a thin peptidoglycan layer.
• D. Both types have equally thick peptidoglycan layers.

Answer: (C)