BotanyIn sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be  present in  this DNA are 

In sea urchin DNA, which is double stranded, 17% of the bases were shown to be cytosine. The percentages of the other three bases expected to be  present in  this DNA are 

  1. A

    G 17%, A 33%, T 33%

  2. B

    G 8.5%, A 50%, T 24.5%

  3. C

    G 34%, A 24.5%, T 24.5%

  4. D

    G 17%, A 16.5%, T 32.5%.

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    Solution:

    In Sea Urchin 17% of bases are cytosine. 

    According to Chargaff’s rule. The amount of Cytosine is equal to the amount of guanine. Therefore, % guanine is 17%. 

    %(A+T)= 100-(17+17)

                = 100-34

                = 66%

    %A= %T= 66/2= 33%

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