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Question : Select the incorrect statement regarding DNA replication.

Answer»

Leading STRAND is formed in `5'to3'` direction
Okazaki fragments are formed in `5'to3'` direction
DNA polymerase catalyses polymerisation in `5' to 3'` direction
DNA polymerase catalyses polymerisation in `3' to 5'` direction

Solution :(d) : Synthesis ofDNA by DNA polymerases occurs only in `5' rarr 3'`direction. One strand called leading strand , is copied in the same direction as theunwinding HELIX. The other strand is known as lagging strand. Replication of lagging strand is in a dicontinuous way , and in the direction of GROWTH of lagging stand is `3' rarr 5'` THOUGH in short segments of DNA which arealways in the`5' rarr 3'` direction.These short segments are called Okazaki fragments joined together by the action od DNA ligase.


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