Respuesta :
Because only the 3' end of the template strand receives additional nucleotides from DNA polymerase.
The DNA molecule has two strands. Leading is the name given to one of the strands, which is continually reproduced in the direction of the fork (3'–5'). The other strand is known as the lagging strand and it replicates in a discontinuous manner (5'-3' direction toward the fork). These two strands are free when DNA helicase opens the replication fork, waiting for complementary nucleotides. However, only the 3' end of the template strand receives additional nucleotides from DNA polymerase. DNA polymerase may easily add nucleotides at the 3' end toward the 5' end (direction 3' to 5') because the leading strand's free end is at the 3' end.
DNA polymerase cannot begin from the lagging strand's 5' free end because it is not free. As a result, replication begins in various locations along the lagging strand so that DNA polymerase can add nucleotides from the 3' end to the 5' end.
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