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29. Mention the source of thermostable DNA polymerase and the step in PCR which it catalyses.
30. A segment of DNA has 1000 nucleotides, of which 300 are guanine-nucleotides. What will be the number of:
      (a) Pyrimidine nucleotides
      (b) Adenine-nucleotides in this DNA?

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==>>  The thermostable DNA polymersase is obtained from bacterium Thermus aquaticus​ 
==>> There are 300 G nucleotides that means the complementary C nucleotides will be 300.
           So, the number of nucleotides left will be 1000-600 = 400.
          As number of A nucleotides = number of T nucleotides.
               Number of  A and T nucleotides will be 200 each.
        a) Hence , number of pyrimidine nucleotides = T + C = 200 + 300 = 500
       b) Number of Adenine nucleotides is A = 200
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