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Chargaff's rule states that DNA from any cell should have a ____ ratio of ______________ and ______________ bases (as per base pairing rule).

a) 1:2, Adenine - Thymine
b) 1:2, Adenine - Cytosine
c) 1:1, Adenine - Guanine
d) 1:1, Adenine - Thymine