下列关于细胞的分裂、分化、癌变、衰老和凋亡等描述中,正确的是

下列关于细胞的分裂、分化、癌变、衰老和凋亡等描述中,正确的是

A.细胞分化过程中,形态、功能不同的细胞中所含有的信使RNA都不相同

B.环境中的致癌因子会损伤细胞中的DNA分子,使原癌基因和抑癌基因发生突变,导致正常细胞的生长和分裂失控而变成癌细胞

C.衰老细胞呼吸速率减慢,细胞核体积变小,核膜内折,染色质收缩、染色加深

D.成熟生物体内,被病原体感染的细胞的清除,不是通过细胞凋亡来完成的

答案

B

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