Which antibiotic is commonly considered bacteriostatic?

Which antibiotic is commonly considered bacteriostatic?

• A. Penicillin G
• B. Amoxicillin
• C. Tetracycline
• D. Vancomycin

Answer: (C)

The main idea here is how antibiotics stop bacteria: bacteriostatic drugs halt growth, giving the immune system a chance to clear the infection, while bactericidal drugs actively kill bacteria. Tetracycline is commonly considered bacteriostatic because it binds reversibly to the 30S ribosomal subunit and blocks the attachment of aminoacyl-tRNA to the ribosome. This stops protein synthesis and prevents bacterial growth, rather than causing rapid bacterial death. The immune system then handles the rest. In contrast, penicillin G and amoxicillin disrupt cell wall synthesis, leading to bacterial lysis, and vancomycin blocks peptidoglycan cross-linking, both of which are typically bactericidal, especially in actively dividing populations. So, tetracycline fits the bacteriostatic category among these options.

The main idea here is how antibiotics stop bacteria: bacteriostatic drugs halt growth, giving the immune system a chance to clear the infection, while bactericidal drugs actively kill bacteria. Tetracycline is commonly considered bacteriostatic because it binds reversibly to the 30S ribosomal subunit and blocks the attachment of aminoacyl-tRNA to the ribosome. This stops protein synthesis and prevents bacterial growth, rather than causing rapid bacterial death. The immune system then handles the rest. In contrast, penicillin G and amoxicillin disrupt cell wall synthesis, leading to bacterial lysis, and vancomycin blocks peptidoglycan cross-linking, both of which are typically bactericidal, especially in actively dividing populations. So, tetracycline fits the bacteriostatic category among these options.