Discussion
One day you wake with a sore throat and a runny nose. Your doctor takes a swab from your throat, sends it to a lab, and telephones you the next day to say that antibiotic will not help you get better.
Answer: D
The antibiotic will not help because you are infected by a virus.
Antibiotics work on structures and processes peculiar to bacteria - the cell wall, bacterial ribosomes, bacterial enzymes. A virus has none of these and replicates inside your own cells, so an antibiotic has nothing to act on. Most sore throats and colds are viral.
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