Which type of bacterial cell wall contains a thick layer of peptidoglycan and teichoic acids?

• A. Acid-fast
• B. Mycoplasma (no cell wall)
• C. Gram-positive
• D. Gram-negative

Answer: (C)

Verified step by step guidance

1. Understand the structure of bacterial cell walls by reviewing the main types: Gram-positive, Gram-negative, Acid-fast, and Mycoplasma (which lacks a cell wall).
2. Recall that Gram-positive bacteria have a thick peptidoglycan layer, which provides rigidity and protection, and also contain teichoic acids embedded within this layer.
3. Recognize that Gram-negative bacteria have a thinner peptidoglycan layer located between an inner cytoplasmic membrane and an outer membrane, and they do not have teichoic acids.
4. Note that Acid-fast bacteria have a unique cell wall rich in mycolic acids, which is different from the typical peptidoglycan structure and does not contain teichoic acids.
5. Identify that Mycoplasma species lack a cell wall entirely, so they do not have peptidoglycan or teichoic acids.