1.

Why do you see two different types of replicating strands in the given DNA replication fork? Explain. Name these strands.

Answer»

The DNA-dependent DNA polymerase catalyses polymerisation only in one direction i.e., 5′→3′. Therefore, in one strand with polarity 3′→5′ continuous replication takes place whereas the other strand with polarity 5′→3′ carries out discontinuous replication. 

The strand with polarity 3′→5′ is called leading strand and the strand with polarity 5′→3′ is called lagging strand.



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