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Mad cow disease is caused by an infectious agent made of abnormally folded protein called a:

AViroid
BVirus
CLichen
DPrion
Answer & Solution
Correct answer: D. Prion
1. It is similar in size to a virus. 2. Prions are misfolded proteins. 3. The human variant is CJD. _Source: syllabus Biology, Chapter 2, Biological Classification._
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