Which statement best describes macrolides' mechanism?

Which statement best describes macrolides' mechanism?

• A. Inhibiting protein synthesis by binding to 50S ribosomal subunit
• B. Inhibiting cell wall synthesis
• C. Inhibiting DNA replication
• D. Inhibiting folate synthesis

Answer: (A)

Macrolides inhibit bacterial protein synthesis by binding to the 50S ribosomal subunit, blocking the translocation step and halting elongation of the peptide chain. By preventing the ribosome from moving along mRNA, they stop protein production. This mechanism is distinct from agents that inhibit cell wall synthesis, DNA replication, or folate synthesis, which explains why macrolides are categorized differently from those classes.

Macrolides inhibit bacterial protein synthesis by binding to the 50S ribosomal subunit, blocking the translocation step and halting elongation of the peptide chain. By preventing the ribosome from moving along mRNA, they stop protein production. This mechanism is distinct from agents that inhibit cell wall synthesis, DNA replication, or folate synthesis, which explains why macrolides are categorized differently from those classes.