If you have a strand of DNA in which 20% of the bases are adenine, what percentage of guanine do you have?

Answer 1

The perecentage of guanine is 30%

According to the Chargaff's rules the DNA from any cell of all organisms should have a 1:1 ratio (base Pair Rule) of purine bases [for the DNA cytosine, thymine and for the RNA uracil] and pyrimidine bases [guanine and adenine for RNA and DNA]. The amount of guanine should be equaled to cytosine and the amount of adenine should be equaled to thymine. You can follow this rule in both strands of the DNA.

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Answer 2

Benjamin Alvin

If 20% of the bases are adenine, then the remaining 80% must be divided equally between cytosine, guanine, and thymine. Therefore, guanine would also be 20% of the bases.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.