In human beings influenza is caused by_________?
Correct answer: C. virus
- A. bacteria
- B. protist
- C. virus
- D. fungi
Explanation
Influenza is caused by influenza viruses, which are enveloped RNA viruses that infect the respiratory tract. Students may choose bacteria because influenza commonly causes fever and respiratory symptoms, but symptoms do not identify the pathogen type.
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About Viruses
Viruses are acellular infectious particles made of genetic material enclosed by a protein capsid, sometimes with a lipid envelope. Their replication depends on a host cell and may follow lytic or lysogenic cycles, so viral structure and reproduction differ fundamentally from those of cellular organisms such as bacteria.
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