Assume that a DNA double helix contains 100 base pairs (one pair is A-T or C-G) and there are 45 cytosines. a. How many guanines are there?
b. How many adenines are there?

Cytosine(C) binds with Guanine(C)

Adenine(A) binds with Thymine(T)

a.From here we can deduct that there are the same number of nucleotides of guanine that as cytosine=>G=45 base pairs

b.2A=100-G-C

   2A=100-90 2A=10 A=5 base pairs

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