試題詳解

20. In his work with pneumonia‐causing bacteria and mice, Griffith found that ______
(A)the protein coat from pathogenic cells was able to transform nonpathogenic cells.
(B)some substance from pathogenic cells was transferred to nonpathogenic cells, making them pathogenic.
(C)the polysaccharide coat of bacteria caused pneumonia.
(D)heat‐killed pathogenic cells caused pneumonia.
(E)the third and fourth answers are correct.