From the list below select the structural properties of DNA that were known by scientists, prior to the contributions of Chargaff, Franklin, Watson, and Crick. (Check all that apply.)

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Before the contributions of Chargaff, Franklin, Watson, and Crick, scientists knew that DNA was composed of nucleotides, that nucleotides contained nitrogen-containing bases, and that there were four nucleotides: adenine, guanine, cytosine, and thymine. However, the concept of complementary base pairing held together by hydrogen bonds was not known until later.

From the List Below Select the Structural Properties of DNA