A fragment of a DNA molecule contains 350 nucleotides and cytosines, which is 28% of the total.
| September 2, 2021 | education
A fragment of a DNA molecule contains 350 nucleotides and cytosines, which is 28% of the total. Determine the total number of nucleotides in DNA and how much adenine, guanine and thymine in a given fragment?
Answer: A = 275, T = 257, G = 350.
In the condition of the problem, it is indicated that the cytosine is 350 by the amount, using the law of complementarity, it can be argued that the guanines are also 350. The percentage of C + G = 28 * 2 = 56%. The total amount of NA in the molecule is 100%. And so, 56% – 750, and 100% – x, x = 700 * 100/56 = 70,000/56 = 1250. Now knowing the total number of NC, you can find how much the sum A + T = 1250 – 700 = 550. By the number of A = T = 550/2 = 275.
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