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EAMCET Medical EAMCET Medical Solved Paper-2010

  • question_answer
    If there are 135 hydrogen bonds between two strands of a fragment of DNA double helix, which contains 23 Guanine nitrogen bases. What is its total length?

    A)  19.04 Å                               

    B)  190.4 Å

    C)  1904 Å                                 

    D)  190.4 nm

    Correct Answer: B

    Solution :

                     If the hydrogen bonds between two strands of a fragment of DNA double helix is 135, then hydrogen bonds between guanine and cytosine is \[\text{(}23\times 3\text{) }69\] (as, GC pairs with three hydrogen bonds). \[\therefore \] The adenine nitrogen bases \[=69-135=66\div 2=33\] The total nitrogen bases = 56 Distance between one \[bp=3,4{\AA}\] \[\therefore \]Total length \[=56\times 3.4=190.4\text{ }{\AA}\]


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