DNA ligases close nicks in the phosphodiester backbone of DNA. Biologically, DNA ligases are essential for the joining of Okazaki fragments during replication, and for completing short-patch DNAsynthesis occurring in DNA repair process. There are two classes of DNA ligases.
The size and position of their centres are the same for homologous Chromosomes
The growth of plants and formation of land mammals characterized the paleozoic era.
From several more prokaryotic cells.
