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1. There is 15.5% cytosine in a cell. How much guanine would there be?

2. Here is another.
If there is 21 % Adenine in a cell, how much Guanine would there be?



Answer :

Answer: 15.5% guanine

1. According to Chargaff's rules, the number of cytosine molecules is always equal to the number of guanine molecules in a DNA strand.
If a DNA molecule has 15.5% cytosine, then according to Chargaff's rules, it will also have 15.5% guanine

2. If a DNA molecule has 21% adenine, it will also have 21% thymine. This is because the number of adenine molecules is always equal to the number of thymine molecules in a DNA strand.
Also, the total percentage of purines (adenine and guanine) is always equal to the total percentage of pyrimidines (cytosine and thymine) in a DNA molecule. So if there is 21% adenine, the percentage of guanine can be calculated as follows:

Let the percentage of guanine be x

Then, A% + G% = T% + C%

21% + x% = 21% + 15.5%

x% = 15.5%

Therefore, if a DNA molecule has 21% adenine, it will have 15.5% guanine.

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