DNA polymerase I unwinds double-stranded DNA nicks DNA ahead of replication fork to relax supercoiling in the DNA synthesizes RNA primers for DNA synthesis elongates DNA strand primer removal and replacement covalently links breaks in the sugar-phosphate backbone.

The correct answer is DNA polymerase 1 helps in primer removal of primer and replacement of covalently links breaks in the sugar phosphate backbone.

Explanation:

DNA polymerase 1 is an important enzyme of DNA replication.DNA polymerase 1 can helps in the attachment of nucleotides in both 3prime to 5prime direction as well as 5 prime to 3prime direction of newly synthesized DNA strand.

DNA plymerase 1 by its 5prime to 3prime exonuclease activity remove the RNA primer from the Template DNA strand and replace the covalently links breaks with appropriate nucleotides .