The agent of controversial nature causing mad cow infection is_____________?
Correct answer: D. Prion
- A. Bacteria
- B. Cowpox Virus
- C. Adenovirus
- D. Prion
Explanation
Mad cow disease, or bovine spongiform encephalopathy, is caused by a prion, an infectious misfolded protein lacking a conventional nucleic-acid genome. Students may choose a virus because the disease is transmissible, but transmissibility alone does not make its agent viral.
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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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