Which of the following statements is NOT correct regarding prions?

W) They can cause scrapie and Creutzfeldt-Jakob diseases [KROYTS-felt Jakob]

X) They infect the same taxa [TAK-suh] as viroids [VY-roids]

Y) They can cause degenerative brain diseases

Z) They are an infectious agent comprised entirely of protein
X) THEY INFECT THE SAME TAXA AS VIROIDS