Final answer:
Protease concentration may affect the infectivity of scrapie lysate by altering the presence of misfolded prion proteins; however, specific studies are needed to establish this connection.
Step-by-step explanation:
The infectivity of scrapie lysate, which is related to prion diseases, is influenced by the concentration of proteases. Scrapie is a prion disease that affects the brain of sheep and goats, and it is characterized by the abnormal folding of prion proteins. When protease concentration increases, it can lead to a change in the infectivity of prion proteins by potentially breaking down these misfolded proteins. The specificity of proteases to certain protein sequences plays a role in determinating their effectiveness in modulating prion infectivity. However, the direct relationship between protease concentration and infectivity of scrapie lysate isn't addressed in the provided information directly, requiring specific studies to elucidate these effects.