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Rosalind Franklin carried out the X-ray crystallography procedure that provided some of the evidence that James Watson and Francis Crick used to propose a three-dimensional model of DNA.

Which of the following features of DNA was NOT suggested by Franklin's results?


The base-paring of A with T and of C with G.


The helical structure of the molecule.


The length of a complete turn of the helix.


The presence of repeated units within the molecule.

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