Identify the correct statement.

Easy

A

Biochemical nature of genetic material was not defined from Griffithâs experiments.
B

Griffith concluded from his experiments that the S strain bacteria can be transformed by the heat-killed R strain bacteria.
C

Mice infected with the R strain develop pneumonia.
D

Griffith injected a mixture of heat-killed S and live R bacteria in mice and observed that the mice survived.

Solution

Biochemical nature of genetic material was not defined from Griffithâs experiments. Oswald Avery, Colin MacLeod and Maclyn McCarty studied the biochemical nature of the genetic material. Finally Hershey and Chase gave an unequivocal proof that DNA is the genetic material.
Griffith concluded from his experiments that the R strain bacteria can be transformed by the heat-killed S strain bacteria.
Griffith injected a mixture of heat-killed S and live R bacteria in mice and observed that the mice died.
Mice infected with the S strain (virulent) die from pneumonia infection but mice infected with the R strain do not develop pneumonia.

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