Antibiotics are useless against viral diseases because viruses
- A. lack their own metabolism and the structures that antibiotics target
- B. are too small for drugs to reach
- C. live only in the soil
- D. are destroyed by stomach acid
Explanation
Antibiotics attack bacterial machinery such as cell walls and 70S ribosomes, and viruses possess neither, borrowing the host's instead. Antivirals must therefore target viral enzymes like reverse transcriptase, which is why far fewer of them exist.
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