A fragment of a DNA molecule consists of 2000 nucleotides, of which 18%
| May 30, 2021 | education
A fragment of a DNA molecule consists of 2000 nucleotides, of which 18% are guanyl nucleotides. Determine the amount of adenyl, thymidyl and cytidyl nucleotides.
Answer: A = 640, C = 360, T = 640.
The problem statement indicates the percentage of guanines and the total number of nucleotides 2000, which is 100%. The number of G = 2000 * 18/100 = 360. According to the law of complementarity: G = C = 360. The sum of guanines and cytidines is 360 * 2 = 720. So now you can find out the sum of adenyl and thymidine NCs: 2000 – 720 = 1280. According to the law of complementarity: A = T = 1280/2 = 640.
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