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Chargaff’s Rule

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

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  1. 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

  2. Guanine = Cytosine Adenine = Thymine

  3. (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

  4. www.web-books.com/MoBio/Free/Ch3B.htm

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