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Which of the following best describes a broad-spectrum antibiotic?

1. Destroys antibodies
2. Acts only on one specific antigen
3. Acts on a wide range of antigens
4. Acts on both antigens and antibodies

Correct answer: Acts on a wide range of antigens

Solution

A broad-spectrum antibiotic is effective against a wide range of disease-causing microorganisms (a wide range of antigens/pathogens), unlike narrow-spectrum antibiotics which act on only a few. Hence it acts on a wide range of antigens.

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