DNA Polymerase I (pol I) removes the RNA primers that are present on the lagging strand and synthesizes the small gaps of the lagging strand during DNA replication.
Pol I also has an important role in synthesizing new nucleotides after mutated DNA base pairs have been removed by the nucleotide excision repair.

University of Wisconsin - Madison

Elongation of DNA replication requires adding the DNA bases of the elongating strands. The primers introduced in initiation are also removed. 
Key terms in prokaryotic elongation:
- DNA Polymerase I

Elongation of DNA Replication in Prokaryotes

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

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DNA Polymerase (pol III) is needed for DNA synthesis. It adds the DNA nucleotides in the 5' to 3' direction to build the complementary strand of DNA.

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