Which of the following statements DOES NOT accurately describe the experimental design used by Fred Griffith? A. The type of bacteria injected into the mouse was the independent variable in his experiment. B. The injection of the live rough bacteria into the mouse is a control because it was used as a standard of comparison for other experimental setups.
C. The dependent variable in the experiment was the health of the mouse after injection.

The correct answer is B. It is false that the injection of the live rough bacteria into the mouse is a control because it was used as a standard of comparison for other experimental setups.

Explanation:

The experiment conducted by Frederick Griffith in 1928 was one of the first experiments to show that bacteria could transfer genetic information.

Griffith used two slightly different pneumococcal strains in his experiment. One of them was harmless to the mice, while the other was not. Using each strain separately, the logical thing happened: the mice died with the fatal strain, and nothing happened with the harmless.

Then, Griffith killed the deadly strain, and mixed both strains, introducing them into the mice. After this, the mice died, which allowed us to verify that the bacteria can transfer genetic material even after dying, through the transformation process.

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