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EAMCET Medical EAMCET Medical Solved Paper-2003

  • question_answer
    In a double helix of DNA molecule of 10 coils, if there are 30 adenine nitrogen bases, what is the number of guanine, nitrogen bases :

    A)  30                                         

    B)  60

    C)  70                                         

    D)  80

    Correct Answer: C

    Solution :

                     Total number of coils in a DNA molecule =10. We know that total number of nitrogen bases are present in a coil =20 (or 10 pairs). Thus, total number of bases in 10 coils\[=10\times 20=200\] Acc. to Chargaff Total number of purine = pyrimidine\[A+G=C+T\] \[\therefore \] out of 200 bases \[A+G=100;C+T=100\] A = 30 (given); Thus, \[G=100-30=70\]


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