A common bacterial resistance mechanism that degrades beta-lactam antibiotics is known as what?

• A. Beta-lactamase production
• B. Efflux pump
• C. Altered penicillin-binding proteins
• D. Porin modification

Answer: (A)

This question centers on how bacteria directly neutralize beta-lactam antibiotics. Bacteria can produce enzymes called beta-lactamases that hydrolyze the beta-lactam ring, a structural feature essential for the drug’s ability to bind its target. When the ring is opened, the antibiotic can no longer inhibit penicillin-binding proteins, so cell-wall synthesis proceeds.

That’s what makes beta-lactamase production a common and effective resistance mechanism. Other strategies—such as efflux pumps that shove the drug out of the cell, alterations of penicillin-binding proteins that reduce drug binding, or changes to porins that limit drug entry—do not destroy the drug themselves; they either reduce intracellular concentration or alter the target, but the antibiotic’s chemical structure remains intact.