If an organism's DNA contains 33% adenine nucleotides and 17% guanine nucleotides, what percentage of its DNA is composed of cytosine nucleotides

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28-04-2022
Biology

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If an organism's DNA contains 33% adenine nucleotides and 17% guanine nucleotides, what percentage of its DNA is composed of cytosine nucleotides

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Oseni Oseni · Answer 1 · 2022-05-06T11:30:31+02:00

A DNA with 33% adenine and 17% guanine nucleotides respectively will contain 17% cytosine.

Purine to Pyrimidine ratio in DNA

According to Chargaff's rule, the ratio of purine to pyrimidine bases in DNA is constant.

Since adenine always pairs with thymine and guanine always pairs with cytosine, adenine to thymine and guanine to cytosine ratios would be constant as well.

Thus, if a DNA contains 17% guanine, it will also contain 17% cytosine.

More on Chargaff's rule can be found here: https://brainly.com/question/14702890

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