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    Question

    What did Erwin Chargaff's research reveal about

    nucleotide bases?
    A All nucleotide bases are present in equal amounts in all species. Correct Answer Incorrect Answer
    B The ratio of different nucleotide bases is consistent across species Correct Answer Incorrect Answer
    C The number of purine bases is always greater than pyrimidine bases Correct Answer Incorrect Answer
    D The number of purine bases is equal to the number of pyrimidine bases Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Chargaff's research demonstrated that the number of purine bases (adenine and guanine) is equal to the number of pyrimidine bases (cytosine and thymine) in DNA molecules.

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