Which statement best describes cell wall synthesis inhibitors' effect on existing cell walls?

Which statement best describes cell wall synthesis inhibitors' effect on existing cell walls?

• A. Affects only cell wall being made, not existing
• B. Disrupts existing cell walls
• C. Inhibits DNA replication
• D. Inhibits protein synthesis

Answer: (A)

Cell wall synthesis inhibitors work by blocking the enzymes that add new peptidoglycan to the growing cell wall. They disrupt the construction process that happens during growth and division, not the already-formed wall. As a result, the drugs affect only the wall that is being made, while the existing, mature wall remains intact. If the bacterium is actively synthesizing wall, the newly formed portion fails to cross-link properly, weakening the cell and leading to lysis over time, but there isn’t immediate disruption of walls that are already there. Other statements describe mechanisms like blocking DNA replication or protein synthesis, which are different antibiotic actions.

Cell wall synthesis inhibitors work by blocking the enzymes that add new peptidoglycan to the growing cell wall. They disrupt the construction process that happens during growth and division, not the already-formed wall. As a result, the drugs affect only the wall that is being made, while the existing, mature wall remains intact. If the bacterium is actively synthesizing wall, the newly formed portion fails to cross-link properly, weakening the cell and leading to lysis over time, but there isn’t immediate disruption of walls that are already there. Other statements describe mechanisms like blocking DNA replication or protein synthesis, which are different antibiotic actions.