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体细胞突变学说 这种学说认为，当生物在某些化学因 素、物理因素、生物因素的作用下， 출장마사지 ，从而导致机体的衰 老。例如，物理学家西拉德曾提出:” 출장마사지
变”。他指出，在高剂量放射线环境中的机体所发生的加速变性，
同衰老过程十分类似。 출장안마 ，就家生殖细胞会发生自发 突变那样，体细胞也可能发生突变。 출장안마 发生变化，并进而造成组织或器官的功能衰退——这就是机体的
衰老。
8 差错灾变学说 这一学说首先由梅德维德夫提出。此学说 认为在蛋白质合成过程中很可能发生差错，例如会发生氨基酸的 错插现象。 출장마사지 (这取决 于 DNA 与 RNA 的遗传信息)，如果合成过程的某一环节发生了 随机的差错，使一种氨基酸的位置被另一种氨基酸所占据，这就 是错插。 출장 — —屯类的催化活性中心——就会发生严重后果、屯的活性会减 弱，专一性降低，甚至完全丧失原有功能，带有差错的屯可以合 成大量有差错、有缺陷的蛋白质，这些有缺陷的蛋白质积累在细
胞中，积累到一定程度细胞就会衰老和死亡。
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