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Chargaff’s Rule The rule states that any sample of DNA shows a 1:1 ratio of the pyrimidine and purine bases G uanine = C ytosine & A denine = T hymine. G uanine = C ytosine A denine = T hymine. (a) B-DNA 10 base pairs / turn (Chime required)
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Chargaff’s Rule The rule states that any sample of DNA shows a 1:1 ratio of the pyrimidine and purine bases Guanine = Cytosine & Adenine = Thymine
Guanine = Cytosine Adenine = Thymine
(a) B-DNA 10 base pairs / turn (Chime required) average helical-twist angle - 35.9 to next base pair - 3.4 (b) A-DNA 10.9 base pairs / turn average helical-twist angle - 33.1 to next base pair - 2.9 (c) Z-DNA life.nthu.edu.tw/.../StrucBio/chapter7_1.html