Which of the following antibiotics acts by inhibiting cell wall synthesis?

 # Which of the following antibiotics acts by inhibiting cell wall synthesis?

a) Doxycycline

b) Aminoglycosides

c) Erythromycin

d) Cefepime

The correct answer is D. Cefepime.

The correct answer is d) Cefepime.

Explanation:

Cefepime is a fourth-generation cephalosporin antibiotic that inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), disrupting peptidoglycan cross-linking, and leading to cell lysis.

Doxycycline (a tetracycline) inhibits protein synthesis by binding to the 30s ribosomal subunit, preventing tRNA attachment.

Aminoglycosides (e.g., gentamicin) also target protein synthesis by binding to the 30s ribosomal subunit, causing misreading of mRNA.

Erythromycin (a macrolide) inhibits protein synthesis by binding to the 50s ribosomal subunit, blocking peptide chain elongation.

Thus, only Cefepime acts by inhibiting cell wall synthesis.