外界环境因子作用于活体细胞内的DNA分子可以造成各种不同类型的损伤,这种损伤是经常发生的,但细胞内存在或诱导产生一系列的酶去连续不断地修复这些损伤,这样才可以保持DNA分子的稳定性及其复制的精确性,从而保证了生物体的正常生命活动及其世代延续的稳定性。所以DNA损伤的修复是重要的生命现象。 External environmental factors act on DNA molecules in living cells can cause a variety of different types of damage, this injury is often occurs, but the presence of cells or induce a series of enzymes to continuously repair these injuries, so that it can Maintain the stability of DNA molecules and the accuracy of their replication, thus ensuring the normal life activities of organisms and the continuity of their stability. Therefore, DNA damage repair is an important life phenomenon.