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The Meselson-Stahl experiment established that: A) DNA polymerase has a crucial role in DNA synthesis. B) DNA synthesis in E. coli proceeds by a conservative mechanism. C) DNA synthesis in E. coli proceeds by a semiconservative mechanism. D) DNA synthesis requires dATP, dCTP, dGTP, and dTTP. E) newly synthesized DNA in E. coli has a different base composition than the preexisting DNA
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