Q. 14. Discontinuous synthesis of DNA occurs in one strand, because
(a) DNA molecule being synthesized is very long
(b) DNA dependent DNA polymerase catalyzes polymerization only in one direction (5'3')
(c) it is a more efficient process
(d) DNA ligase has to have a role
Ans (b). DNA polymerase adds deoxyribonucleotides to the free '-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 catalyzes polymerization only in one direction (5'3'), discontinuous synthesis of DNA occurs in the other strand.
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