The chemical reactions and pathways involving nucleobases, nucleosides, nucleotides and nucleic acids [goid 6139] [evidence IEA]; The process whereby new strands of DNA are synthesized. The template for replication can either be an existing DNA molecule or RNA [goid 6260] [evidence IEA]; Progression through S phase, the part of the mitotic cell cycle during which DNA synthesis takes place [goid 84] [pmid 16762037] [evidence IDA]; Synthesis of DNA that proceeds from the broken 3' single-strand DNA end uses the homologous intact duplex as the template [goid 731] [pmid 1508673] [evidence IMP]; Synthesis of DNA that proceeds from the broken 3' single-strand DNA end uses the homologous intact duplex as the template [goid 731] [pmid 3335506] [evidence IDA]; Synthesis of DNA that proceeds from the broken 3' single-strand DNA end uses the homologous intact duplex as the template [goid 731] [pmid 1730053] [evidence IMP]; The chemical reactions and pathways involving nucleobases, nucleosides, nucleotides and nucleic acids [goid 6139] [evidence IEA]; The process by which DNA replication is started; this involves the separation of a stretch of the DNA double helix, the recruitment of DNA polymerases and the initiation of polymerase action [goid 6270] [pmid 2175912] [evidence IDA]; The synthesis of DNA from a template strand in the 5' to 3' direction; leading strand elongation is continuous as it proceeds in the same direction as the replication fork [goid 6272] [pmid 2175912] [evidence IDA]; The synthesis of DNA from a template strand in the 5' to 3' direction; leading strand elongation is continuous as it proceeds in the same direction as the replication fork [goid 6272] [pmid 7910375] [evidence IDA]; The synthesis of DNA from a template strand in a net 3' to 5' direction. Lagging strand DNA elongation proceeds by discontinuous synthesis of short stretches of DNA, known as Okazaki fragments, from RNA primers; these fragments are then joined by DNA ligase. Although each segment of nascent DNA is synthesized in the 5' to 3' direction, the overall direction of lagging strand synthesis is 3' to 5', mirroring the progress of the replication fork [goid 6273] [pmid 2175912] [evidence IDA]; The synthesis of DNA from a template strand in a net 3' to 5' direction. Lagging strand DNA elongation proceeds by discontinuous synthesis of short stretches of DNA, known as Okazaki fragments, from RNA primers; these fragments are then joined by DNA ligase. Although each segment of nascent DNA is synthesized in the 5' to 3' direction, the overall direction of lagging strand synthesis is 3' to 5', mirroring the progress of the replication fork [goid 6273] [pmid 7910375] [evidence IDA]; The repair of a double-strand break in DNA in which the two broken ends are rejoined with little or no sequence complementarity. Information at the DNA ends may be lost due to the modification of broken DNA ends [goid 6303] [pmid 11470886] [evidence IMP]; The multiplication or reproduction of cells, resulting in the expansion of a cell population [goid 8283] [pmid 3359994] [evidence IDA]