Multiple choice

DNA of an organism has thymine as 20% of its bases. What % of its bases would be guanine?

  1. 20%

  2. 30%

  3. 40%

  4. 60%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

According to Chargaff's rules, A=T and G=C. If Thymine is 20%, then Adenine is also 20%. The remaining 60% must be split equally between Guanine and Cytosine, so Guanine is 30%.

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