If a piece of double stranded DNA consisting of 20 nitrogenous bases contains three G nitrogenous bases on one chain of the strand

If a piece of double stranded DNA consisting of 20 nitrogenous bases contains three G nitrogenous bases on one chain of the strand

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Answer

• The corresponding piece of mRNA generated from one of the DNA strands must contain three nitrogenous bases in this region.
  Explanation:
  This is in accordance to the Chargaff’s rule which states that the DNA of any cell must contain equal number of pyrimidine and purine bases in 1:1 ratio such that the number of Guanine bases are equal to the number of Cytosine bases. If a strand has three Guanine bases, the complimentary strand must contain equal number (3) of cytosine bases because Guanine pairs with Cytosine.