Prions are __________ that are thought to cause disease by __________.

• A. RNA molecules; encoding toxic proteins
• B. mutant DNA molecules; encoding toxic proteins
• C. an abnormal type of capsid; dramatically enhancing the rate of viral infection
• D. DNA molecules; jumping around the genome and mutating genes
• E. abnormally shaped proteins; inducing similar but normally shaped proteins in the brain to adopt the abnormal form