an analysis of the nucleus of a hamster isolates a dna sample that contains 600 nitrogenous bases. upon dna sequencing of the sample, 50 bases were determined to be adenine. which describes the ratio of cytosine to thymine in the sample?

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26-10-2022
Biology

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an analysis of the nucleus of a hamster isolates a dna sample that contains 600 nitrogenous bases. upon dna sequencing of the sample, 50 bases were determined to be adenine. which describes the ratio of cytosine to thymine in the sample?

Answer :

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QWTiffany QWTiffany · Answer 1 · 2022-10-29T12:33:41-04:00

The ratio of cytosine to thymine in the sample is 5:1.

As per the known fact, Adenine always binds to thymine via two hydrogen bonds. Also, Guanine always binds to cytosine through three hydrogen bonds. This implies, that number of adenine will be equal to thymine. The number of guanine will also be equal to cytosine.

So, number of adenine = 50

Number of thymine = 50

Total number of adenine and thymine = 50 + 50

Performing addition

Total number of adenine and thymine = 100

Remaining nitrogenous bases = 600 - 100

Performing subtraction

Remaining nitrogenous bases = 500

Number of cytosine = 500 ÷ 2

Performing Division

Number of cytosine = 250

So, ratio of cytosine to thymine = 250:50

Again dividing

Ratio of cytosine to thymine = 5:1

Hence, cytosine to thymine is in the ratio 5:1.

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