The number of adenine molecules in a given DNA segment is 25 and the number of cytosine molecules is 45, the total number of nucleotides in the segment is _______________.

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The number of adenine molecules in a given DNA segment is 25 and the number of cytosine molecules is 45, the total number of nucleotides in the segment is 140. A = T and G = C for DNA now, total nucleotide = A + T + G + C = 2(C) + 2(A) = 50 + 90 = 140

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