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the entire mRNA strand that codes for collagen consists of 5% adenine, 30% guanine, 40% cytosine,...

the entire mRNA strand that codes for collagen consists of 5% adenine, 30% guanine, 40% cytosine, and 25% uracil. what is the avergae percentage of the entire DNA strand (double helix DNA, meaning the template starnd plus the non template strand)that would be cytosine?
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Answer #1

According to the Chargaff's rules, the DNA from any cell of all organisms should have a 1:1 ratio (base pair rule) of purine bases [for the DNA cytosine, thymine and for the RNA uracil]. The amount of guanine should be equated to cytosine and the amount of adenine should be equaled to thymine.The purine always pairs with pyrimidines. Cytosine pairs with guanine and adenine pairs with thymine.

5 % adenine + 30 % guanine + 40 % cytosine + 25% uracil = 100 % DNA bases

C ≡ G 30%

T ≡ A 5%

A ≡ T 25% (Uracil is converted to Thymine in DNA)

G ≡ C 40%

100% - (5 % + 25 %) = 70% DNA base - ( Adenine % + Thymine %)

70% / 2 = 35%

35% of Cytosine .

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