A) Mice were required to demonstrate the transforming principle
B) Used serum to precipitate IIIS cells from a mixture of heat-killed IIIS and living IIR cells
C) They showed that mice play no direct role in the transforming principle
D) Heat-killed IIR cells mixed with living IIIS cells gave rise to IIR colonies
E) None of these

A) Lipids and proteins
B) Proteins and nucleic acids
C) Nucleic acids and polysaccharides
D) Proteins and polysaccharides

A) Proteins were larger than nucleic acids
B) Nucleic acids exhibit less structural variability than proteins
C) It was proven in 1871 that proteins were the source of genetic material
D) All of these
E) None of these