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OpenStudy (anonymous):
What pattern did Erwin Chargaff discover in nitrogen bases? A-In a DNA molecule, adenine always pairs with uracil and guanine always pairs with cytosine. B-Complimentary base pairing of nitrogen bases in DNA is different for each life form on Earth. C-The number of adenine bases is always equal to the number of thymine bases, and the number of cytosine bases is always equal to the number of guanine bases. D-All life forms on Earth contain the same number of adenine, guanine, thymine, and cytosine bases.
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