Practice question
Question
A piece of DNA was analyzed and 15% of its nucleotides were adenine. What percentage would be uracil?
Explanation
DNA never contains uracil under normal conditions; uracil occurs in RNA replacing thymine. Chargaff's rules apply to adenine-thymine pairing, but uracil is absent except transient deamination errors. Hence percentage of uracil in analyzed DNA is zero.
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