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科学家认为,理论上人类寿命有120岁,乌龟有150岁,狗有20岁。这种物种之间的寿命差异是由基因决定的。科学家已经在若干个物种里找到了跟寿命有关的基因,其中既有延长寿命的“长寿”基因,也有缩短寿命的基因。生物体内有一种新陈代谢的副产物,叫活性氧,也叫自由基,与机体老化、癌症等疾病的发生密切相关。细胞氧化会造成细胞损伤或老化,而“长寿”基因的产物能防止细胞氧化,从而使人长寿。还有些基因的产物能修复受
Scientists believe that theoretically human life expectancy is 120 years old, the turtle is 150 years old, the dog is 20 years old. The difference in life span between species is genetically determined. Scientists have found life-sustaining genes in several species, including both “longevity” genes that extend lifespan and genes that reduce lifespan. Organisms have a metabolic by-product, called reactive oxygen species, also known as free radicals, and the body aging, cancer and other diseases are closely related. Cell oxidation can cause cell damage or aging, and the product of the “long-lived” gene prevents cells from oxidizing and thus longevity. Some gene products can repair by