How do the repairing enzymes of the genetic system act?

There are enzymes inside the cells that detect errors or alterations in DNA molecules and begin a repair of those errors. First, the enzymes called as restriction endonucleases, specialized in cutting DNA molecules (as well used in genetic engineering), cut the affected piece of DNA. Then the polymerase enzymes build correct sequences of nucleotides correspondent to the affected piece taking as template the DNA chain complementary to the affected chain and finally the new correct sequence is bound in the DNA under repair by specific enzymes.