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Question
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 _______________.
Options
70
140
90
50
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Solution
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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