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DNA replication

Process by which the cell copies its DNA before dividing.

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Concept

DNA replication

Process by which the cell copies its DNA before dividing.

It is the semiconservative process by which one DNA molecule serves as a template to synthesize two daughter molecules before cell division. Each resulting molecule retains one parental strand and contains one newly synthesized strand.

Replication ensures faithful transmission of genetic information and is coordinated with proofreading and repair mechanisms. Its enzymes and protein complexes must copy extensive genomes with high precision.

The video places replication as the first of the three processes of the central dogma, the step in which DNA is duplicated before transcription and translation. It shows DNA gyrase releasing tension in the helix and helicase opening the replication fork, where primase places the primers and DNA polymerase III synthesizes the leading strand continuously and the lagging strand in Okazaki fragments. It notes that DNA polymerase I and ligase complete and join those fragments to obtain two identical molecules through a semiconservative mechanism, and that the process is specific to Escherichia coli.

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