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27 January, 19:08

Assume a certain molecule of dna is composed of exactly 22 percent adenine. how much cytosine would you expect to find in this molecule

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  1. 27 January, 22:07
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    The amount of purine is always equal to the amount of pyramidine in a certain DNA molecule or can be written as:

    [A] + [G] = [C] + [T]

    where A is adenine, G is guanine, C is cytosine and T is thymine

    But according to Chargaff’s rule, the amount of Guanine is equal to Cytosine, so that:

    [G] = [C]

    Hence,

    [A] + [C] = [C] + [T]

    Cancel [C]:

    [T] = [A]

    [T] = 22%

    So that means:

    [G] = [C] = 28%

    So there is 28% Cytosine
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