What is the mechanism of action of antibiotics?

• A. They enhance host immune function
• B. They inhibit the synthesis of viral proteins
• C. They target specific bacterial functions
• D. They promote bacterial cell growth

Answer: (C)

The mechanism of action of antibiotics primarily involves targeting specific bacterial functions. Each class of antibiotic operates through different mechanisms to disrupt essential processes in bacteria, such as cell wall synthesis, protein synthesis, nucleic acid synthesis, or metabolic pathways.

For example, penicillins target penicillin-binding proteins involved in cell wall synthesis, leading to cell lysis. Tetracyclines interfere with ribosomal RNA to inhibit protein synthesis, while fluoroquinolones target enzymes necessary for DNA replication. By specifically inhibiting bacterial functions without affecting human cells, antibiotics can effectively control bacterial infections.

In contrast, the other options do not accurately represent the action of antibiotics. Enhancing host immune function pertains more to vaccination or immunotherapy, while inhibiting the synthesis of viral proteins is a mechanism relevant to antiviral drugs, not antibiotics. Promoting bacterial cell growth is counterproductive to the purpose of antibiotics, which aim to eliminate or inhibit bacterial proliferation.