There are 100 nucleotides with thymine in a DNA molecule, which is 10% of the total. How many nucleotides are there with guanine?

100 nucleotides – 10%
X nucleotides – 100%
X = (100 100): 10 = 1000 nucleotides in total.
Thymine = adenine = 100 nucleotides
There are 800 guanine with cytosine, which means 400 each.

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