Bactericidal antibiotics are capable of:

A. Weakening the cell walls of the microbes: Bactericidal antibiotics act by directly killing bacteria rather than merely inhibiting their growth. Many bactericidal agents, such as beta-lactams and vancomycin, target bacterial cell wall synthesis, disrupting peptidoglycan cross-linking. This leads to cell lysis due to osmotic instability, effectively eliminating the bacterial population. B. Inhibition of nucleic acid metabolism: Inhibiting nucleic acid synthesis, as seen with fluoroquinolones or rifampin, can be bactericidal or bacteriostatic depending on the organism and drug concentration. While some bactericidal antibiotics do affect nucleic acid metabolism, this mechanism is not universally responsible for bactericidal activity across all antibiotics. C. Interference with cell metabolism: Interfering with bacterial metabolic pathways, such as folate synthesis inhibition by sulfonamides or trimethoprim, primarily results in bacteriostatic effects rather than direct killing. These drugs prevent replication and growth but do not immediately cause bacterial cell death. D. Inhibition of CYP450 and sterol C-14 alpha-demethylation: This mechanism is characteristic of azole antifungals like ketoconazole, which inhibit ergosterol synthesis in fungal cell membranes. It is not a bactericidal mechanism and does not apply to antibiotics targeting bacterial pathogens.