The diseases bovine spongiform encephalopathy and Creutzfeldt—Jakob disease are caused by what kind of protein? How does this protein cause these diseases?
What will be an ideal response?
These diseases are caused by the prion protein. The healthy prion (PrPC) is characterized by the secondary structure of alpha helices whereas the diseased prion (PrPSc) is characterized by the secondary structure of beta sheets.
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L-amino acids occur in proteins and are designated
A. unnatural. B. natural. C. rare. D. left handed. E. natural AND left handed.
The best way to prevent desertification is to avoid farming in areas subject to ____
a. flooding b. deforestation c. acid rain d. high winds and periodic drought e. topsoil buildup
Proto-oncogenes _____
A) normally suppress tumor growth B) are produced by somatic mutations induced by carcinogenic substances C) stimulate normal cell growth and division D) are underexpressed in cancer cells
The dengue viruses are spread by (fleas/mosquitoes/ticks)
What will be an ideal response?