alleryMad cow disease is caused by an agent called a:
APrion
BPrison
CProton
DProtist
Answer & Solution
Correct answer: A. Prion
1. The agent is an abnormally folded protein.
2. It is about the size of a virus.
3. Such agents are called prions.
_Source: syllabus Biology, Ch 2 'Biological Classification'_
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