A patient with bacterial pneumonia was prescribed benzylpenicillin. What is the mechanism of its antibacterial effect?

Answer options

1. Abnormal permeability of cytoplasmic membrane
2. Inhibition of intracellular protein synthesis
3. Inhibition of SH-groups of microorganism enzymes
4. Antagonism with p-amino-benzoic acid
5. Inhibition of synthesis of microorganism wall

Explanation

Penicillins are beta-lactam antibiotics that inhibit the formation of peptidoglycan cross-links in the bacterial cell wall.