How does the structure of PrPSC differ from PrPC, and what is the consequence of this difference?

• A. PrPSC lacks a tertiary structure, preventing it from interacting with PrPC.
• B. PrPSC has a beta-sheet rich structure, causing it to aggregate and convert PrPC into PrPSC.
• C. PrPSC is a smaller protein, allowing it to easily penetrate cell membranes.
• D. PrPSC has an alpha-helix rich structure, making it more stable than PrPC.

Answer: (B)