12th Class Biology Molecular basis of inheritance

  • question_answer 28)   Discontinuous synthesis of DNA occurs in one strand, because (a) DNA molecule being synthesized is very long (b) DMA dependent DNA polymerase catalyze? Polymerization only in one direction (5' 3') (c) it is a more efficient process (d) DNA ligase has to have a role  

    Answer:

                      (b) DNA polymerase adds deoxyribose nucleotides to the free 3'-end of the growing polynucleotide chain so, that replication of the 3' 5' strand of the DNA molecule is continuous (growth of the new strand in 5' 3'direction). Since, DNA dependent DNA polymerase catalyses polymerization only in one direction (53'), discontinuous synthesis of DNA occurs in the other strand.

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