Read the following statements regarding the search for genetic material and select the option that contains only the correct statements. (A) Prior to the work of Oswald Avery, Colin MacLeod, and Maclyn McCarty, the genetic material was widely thought to be a protein. (B) In Griffith's experiment, mice injected with only heat-killed S-strain bacteria developed pneumonia and died. (C) Avery, MacLeod, and McCarty observ

Step-by-step solution

Statement (A) is correct. Prior to the work of Oswald Avery, Colin MacLeod, and Maclyn McCarty (1933-44), the genetic material was widely thought to be a protein. Statement (B) is incorrect. In Griffith's experiment, mice injected with only heat-killed S-strain bacteria survived and did not develop pneumonia. They died only when injected with a mixture of heat-killed S-strain and live R-strain bacteria. Statement (C) is correct. Avery, MacLeod, and McCarty purified biochemicals (proteins, DNA, RNA, etc.) from the h