DNA ligase is an essential enzyme in molecular biology that plays a critical role in DNA replication and repair. Its primary function is to join together two DNA strands by forming phosphodiester bonds between the sugar and phosphate groups of adjacent nucleotides. This process is crucial for the following reasons: 1. **DNA Replication**: During DNA replication, the enzyme aids in the joining of Okazaki fragments on the lagging strand, creating a continuous DNA strand.
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