Drug that inhibits cell wall synthesis is ?
**Core Concept**
The question is testing the student's knowledge of the mechanism of action of antibiotics that target bacterial cell wall synthesis. Cell wall synthesis is a critical process in bacterial cell division, and inhibiting this process can lead to bacterial cell lysis and death. This is a key concept in understanding the antibacterial spectrum of various antibiotics.
**Why the Correct Answer is Right**
The correct answer is a beta-lactam antibiotic, which works by inhibiting the enzyme transpeptidase that is responsible for cross-linking peptidoglycan layers in the bacterial cell wall. This leads to weakened cell walls, making the bacteria more susceptible to osmotic lysis. The mechanism of action of beta-lactam antibiotics involves binding to penicillin-binding proteins (PBPs) on the bacterial cell wall, thereby inhibiting the synthesis of peptidoglycan.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it refers to a different class of antibiotics that target protein synthesis, not cell wall synthesis.
**Option B:** This option is incorrect because it refers to a class of antibiotics that target DNA replication, not cell wall synthesis.
**Option C:** This option is incorrect because it refers to a class of antibiotics that target the bacterial cell membrane, not cell wall synthesis.
**Clinical Pearl / High-Yield Fact**
Beta-lactam antibiotics are effective against a wide range of Gram-positive and Gram-negative bacteria, but resistance to these antibiotics is becoming increasingly common due to the emergence of beta-lactamase-producing bacteria.
**Correct Answer:** C. Penicillin.