What component is abundant in the cell wall of the mycobacteria that is lacking in other bacteria?

What component is abundant in the cell wall of the mycobacteria that is lacking in other bacteria?

• A. Sterols
• B. Lipids
• C. Murein
• D. Teichoic acid

Answer: (B)

Mycobacteria are defined by a cell wall that is unusually rich in lipids, especially long-chain mycolic acids, which form a waxy, hydrophobic barrier. This lipid-dense envelope makes the wall highly impermeable and is responsible for acid-fast staining. In contrast, other bacteria rely more on peptidoglycan (murein) and, in Gram-positive organisms, teichoic acids; sterols are not a defining feature of bacterial cell walls. Thus, the abundant component in mycobacterial walls is lipids.

Mycobacteria are defined by a cell wall that is unusually rich in lipids, especially long-chain mycolic acids, which form a waxy, hydrophobic barrier. This lipid-dense envelope makes the wall highly impermeable and is responsible for acid-fast staining. In contrast, other bacteria rely more on peptidoglycan (murein) and, in Gram-positive organisms, teichoic acids; sterols are not a defining feature of bacterial cell walls. Thus, the abundant component in mycobacterial walls is lipids.