Respuesta :
In a sample of DNA, thymine will make up 10% of the total.
DNA structure:
According to Chargaff, nucleotide subunits make up the DNA. The double-stranded DNA molecule is created by these nucleotides forming hydrogen bonds with one another.
The following nucleotides can be found in the DNA molecule:
- Adenine
- Guanine
- Thymine
- Cytosine
While Guanine (G) couples with Cytosine (C), Adenine (A) pairs with Thymine (T).
According to Chargaff's rule, the ratio of adenine to thymine in a DNA molecule is equal. The same holds true for cytosine and guanine. The entire number of nucleotides, however, is 1, or 100%.
A + T + G + C = 100%.
if cytosine makes up 40% of the DNA sample, this means that guanine will also be 40%.
G (40) + C (40) = 80%
100% - 80% =20%
This means that Adenine and Thymine amounts to 20%. The amount of each nucleotide will be 20% ÷ 2 = 10% i.e. A = T = 10%
Therefore, the percentage of thymine in a sample of the DNA will be 10%.
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