A) Leading strand is formed in \[5'\to 3'\] direction
B) Okazaki fragments are formed in \[5'\to 3'\] direction
C) DNA polymerase catalyses polymerization in \[5'\to 3'\] direction
D) DNA polymerase catalyses polymerization in \[3'\to 5'\] direction
Correct Answer: D
Solution :
[d] Synthesis of DNA by DNA polymerases occurs only in \[5'\to 3'\]direction. One strand called leading strand, is copied in the same direction as the unwinding helix. The other strand is known as lagging strand. Replication of lagging strand occurs in discontinuous way, synthesizing short segments of DNA which are always in the \[5'\to 3'\] direction. These short segments are called Okazaki fragments joined together by the action of DNA ligase.
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