The DNA molecule contains 1120 adenyl nucleotides, which is 28% of the total number

| July 23, 2021 | education

The DNA molecule contains 1120 adenyl nucleotides, which is 28% of the total number of nucleotides. Determine the number of other nucleotides and the length of this molecule.

In a DNA molecule, nucleotides are connected according to the principle of complementarity: A – T, G – C. If there are 1120 adenyl nucleotides in a molecule, then the same number of thymidyl nucleotides. So W (A + T) = 56%, hence W (G + C) = 44%. We will compose the proportion and solve it 1120 – 28%, x – 44%; x = 1120 * 44/28 = 1760 – guanyl and cytidyloid together, i.e. 880 each.
The length of one nucleotide is 0.34 nm, in total there are 4000 nucleotides in a molecule, since there are two chains, then the length of the molecule is 2000 * 0.34 = 680nm
Answer: n (T) = 1120, n (G) = 880, n (C) = 880, l (DNA) = 680nm.



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