A short length linear double-stranded DNA molecule has 110 thymine and 110 guanine bases. The total number of nucleotide in the DNA fragment will be
A
110
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B
880
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C
440
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D
220
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Solution
The correct option is A 440 There are 110 thymine and 110 guanine bases in the double-stranded DNA molecule. The number of thymine will be equal to adenine which will form the pair with the help of hydrogen bonds and so there are 110 adenine. Similarly, for guanine, there will be 110 cytosine to base pair with guanine. So, the total number of nitrogen bases are 440.