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Anna
Anna asked in Science & MathematicsBiology · 6 years ago

if there is 40% thymine in a strand of DNA, how much guanine is present?

I'm studying for Biology exams and I don't understand it at all and I need help with this question. thank you!

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  • Formerly Peter S
    Lv 7
    6 years ago

    10%

    A=T and G=C

    A+T = 805

    G+C =20%

  • Asst Prof
    Lv 7
    6 years ago

    10%. If there is 40%T, then there must be 40% A, because there is an A for every T. Since 40% + 40% = 80%, there must be 20% G and C. Since the amount of G and C must be equal, there must be 10% of each.

    Source(s): 40 years teaching Biology
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