39. What are prions?
(A) misfolded versions of normal brain protein
(B) tiny molecules of RNA that infect plants
(C) viral DNA that has had to attach itself to the host genome
(D) viruses that invade bacteria
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統計: A(6), B(0), C(1), D(0), E(0) #2765602
統計: A(6), B(0), C(1), D(0), E(0) #2765602