Question

A scientist determines that there is 25% cytosine in a double stranded piece of dna. What can you infer as true?.

Answer 1

Because cytosine and guanine couple, the quantity will always be the same.

If the cytosine content is 20%, what is the thymine content?

There is 20% guanine for every 20% cytosine. Accordingly, 60% of the DNA is made up of thymine and adenine while 40% of the DNA is made up of cytosine and guanine. Thymine and adenine must both be present in equal amounts, therefore this DNA molecule has about 30% of each.

If 20% of the nitrogenous bases in a DNA molecule are adenine, what is the percentage of cytosine?

Thymine is 20% as well since adenine is 20%. Together, they account for 40%. The remaining 60% of 100 is split evenly between guanine and cytosine, making each one 30%. the uracil  not found in DNA but it will have the same percentage as thymine,  the RNA will have 30% uracil.

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