O Levels Biology (5090)•5090/11/M/J/21

Explanation
Antibiotics target bacteria, not viruses
Steps:
- Identify HIV as a viral infection caused by the human immunodeficiency virus.
- Recall that antibiotics are medications designed to kill or inhibit bacteria.
- Note that viruses replicate inside host cells using the host's machinery, unlike independent bacterial cells.
- Conclude antibiotics cannot interfere with viral replication processes.
Why B is correct:
- Antibiotics specifically target bacterial cell structures like peptidoglycan walls or protein synthesis ribosomes, which viruses lack as they are non-cellular entities.
Why the others are wrong:
- A: Viral size does not determine antibiotic efficacy; mechanism of action does.
- C: Viral composition of protein and DNA/RNA is irrelevant to antibiotic targeting.
- D: Viruses are pathogens, as HIV causes AIDS by attacking the immune system.
Final answer: B
Topic: Antibiotics
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