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【单选题】
下列有关细胞核的叙述，正确的是 [ ]A.
细胞核是活细胞进行细胞代谢的主要场所
B.
衰老细胞的体积变小，但是细胞核体积增大，核膜内折，染色缩
C.
细胞没有具核膜的细胞核，细胞只有一个具核膜的细胞核
D.
有丝分裂过程中，细胞核中的染色体通过复制数目加倍
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