Which event takes place during the elongation stage of DNA replication?

A. The leading strand is built first, and then the lagging strand is built.
B. RNA primers are replaced by sections of DNA prior to ligation.
C. DNA polymerase adds nucleotides and checks for errors.
D. The sugars and phosphate groups are added to nitrogenous bases to form complete nucleotides.



Answer :

Final answer:

During DNA replication elongation, DNA polymerase adds nucleotides to the leading strand continuously while the lagging strand is synthesized in fragments with replacement of RNA primers by DNA nucleotides.


Explanation:

During the elongation stage of DNA replication, DNA polymerase adds nucleotides to the leading strand continuously in the 5' → 3' direction. Meanwhile, on the lagging strand, DNA is synthesized in short Okazaki fragments, each requiring its own primer. The RNA primers are replaced with DNA nucleotides, and DNA ligase seals the gaps between these fragments.


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