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Step 1 - Stomatology 2013

A 29-year-old patient with bacterial pneumonia has been administered penicillin. What is the mechanism of its antimicrobial action?

Inhibition of intracellular protein synthesis
Antagonism of PABA
Inhibition of cholinesterase activity
Inhibition of cell walls synthesis in the microorganisms
Inhibition of SH-groups of microorganism enzymes