Which of the following is bacteriostatic antibiotics?

Question

Accepted Answer

Tetracycline is the correct answer as a bacteriostatic antibiotic. Here's a detailed explanation:

1. **Tetracycline (Option 1)**: Tetracycline is classified as a bacteriostatic antibiotic, which means it inhibits the growth and reproduction of bacteria rather than killing them directly. It achieves this by interfering with the bacterial ribosome, thereby inhibiting protein synthesis. This action prevents bacteria from multiplying, allowing the immune system to eliminate the pathogens more effectively. Tetracycline is commonly used to treat a variety of infections, including acne, respiratory tract infections, and certain sexually transmitted infections.

2. **Ofloxacin (Option 2)**: Ofloxacin is a fluoroquinolone antibiotic, which is bactericidal rather than bacteriostatic. It works by inhibiting bacterial DNA gyrase and topoisomerase IV, enzymes critical for DNA replication and transcription. This action leads to the death of the bacteria, making it a bactericidal agent.

3. **Aminoglycosides (Option 3)**: Aminoglycosides, such as gentamicin and streptomycin, are also bactericidal antibiotics. They bind to the bacterial 30S ribosomal subunit, causing misreading of mRNA and ultimately leading to the production of faulty proteins. This mechanism results in bacterial cell death, distinguishing them from bacteriostatic agents.

4. **Penicillin (Option 4)**: Penicillin is a well-known bactericidal antibiotic. It works by inhibiting the synthesis of bacterial cell walls, specifically by targeting the penicillin-binding proteins involved in the cross-linking of the peptidoglycan layer. This disruption leads to cell lysis and death, making penicillin a bactericidal agent.

In summary, Tetracycline is the correct answer as it is a bacteriostatic antibiotic, inhibiting bacterial growth and allowing the immune system to combat the infection. The other options, Ofloxacin, Aminoglycosides, and Penicillin, are bactericidal, meaning they kill bacteria directly.