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Cytosine makes up 38% of the nucleotides in a sample of dna from an organism. approximately, what percentage of the nucleotides in this sample will be thymine?

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liz33312
Cytosine will always base pair with Guanine (assuming no mutations present).
If Cytosine makes up 38% of DNA, Guanine will also make up 38% of DNA.

Adenine will always base pair with Thymine (similarly assuming no mutations present).
The remaining percentage that is not Cytosine nor Guanine will be 100% - 38% - 38% = 24%
Adenine and Thymine together make up 24% of DNA.
Adenine and Thymine should have the same percentage.
Adenine % = Thymine % = 24% ÷ 2 = 12%

Hope this helps! :)
samueladesida43

The percentage of thymine in a sample of the DNA will be 12%.

Structure of DNA:

  • The DNA, according to Chargaff, is made up of nucleotide subunits. These nucleotides are hydrogen-bonded to one another to form the double stranded molecule of DNA.

The nucleotides found in the DNA molecule are as follows:

  1. Adenine
  2. Thymine
  3. Cytosine
  4. Guanine

  • Adenine (A) pairs with Thymine (T) while Guanine (G) pairs with Cytosine (C).

  • Based on Chargaff's rule, the amount of adenine is equal to that of thymine in a DNA molecule. The same applies to Guanine and Cytosine. However, the total amount of nucleotides equals 1 or 100%.

A + T + G + C = 100%.

  • If cytosine makes up 38% of the DNA sample, this means that guanine will also be 38%.

G (38) + C (38) = 76%

100% - 78% = 24%

  • This means that Adenine and Thymine amounts to 24%. The amount of each nucleotide will be 24% ÷ 2 = 12% i.e. A = T = 12%

  • Therefore, the percentage of thymine in a sample of the DNA will be 12%.

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