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Eduncle posted an MCQ
December 30, 2019 • 19:56 pm 0 points
  • CSIR NET
  • Life Sciences

Which one of the following set of essential components are required for Sanger method of DNA sequencing in a required buffer containing MgCl2 and Trix-HCl ?

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    Eduncle Best Answer

    The DNA sample is divided into four separate sequencing reactions, containing all four of the standard deoxynucleotides (dATP, dGTP, dCTP and dTTP) and the DNA polymerase. To each reaction is added only one of the four dideoxynucleotides (ddATP, ddGTP, ddCTP, or ddTTP), while the other added nucleotides are ordinary ones. The dideoxynucleotide concentration should be approximately 100-fold lower than that of the corresponding deoxynucleotide (e.g. 0.005mM ddTTP : 0.5mM dTTP) to allow enough fragments to be produced while still transcribing the complete sequence.
     

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