Frederick Griffith's work with two strains of the same bacteria, one harmful
and the other harmless, showed that:
A. cells contain a transforming factor.
B. a DNA molecule is a double helix.
C. two alleles interact to produce a trait.
D. DNA carries a code for making proteins.
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Frederick Griffith's work with two strains of the same bacteria, one harmful
and the other harmles...
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