Answer:
30%
Explanation:
this is not my work but I looked it over and found it could be helpful to you
The analysis of a DNA molecule reveals that 30% of its nucleotides are adenine. The percentage of the same DNA molecule expected to be guanine nucleotides would be 20%
Remember that the addition of all nucleotides should give a 100%. In the DNA molecule, the nucleotides present are adenine, guanine (both purine), cytosine and thymine (both pyrimidine).
Adenine always form double bonds with thymine and the amounts present for each are always the same. The same also applies to Guanine and cytosine.
From the question the amount of adenine is 30%, therefore that of thymine will be 30%. As said earlier, the sum of all nucleotides must equal 100%, we have 100-60 = 40% where the 60% is the sum of thymine and adenine.
The amount of guanine will then be 40/2 = 20%. The other 20% belongs to cytosine.
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