在细胞周期的G2 期早期和M期早期，周期蛋白的浓度最高。
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细胞分化的本质是()。
A. 功能上重新分工
B. 基因选择性表达的结果
C. 分裂不均匀所致
D. 某些细胞丢失部分基因
What is the author's attitude towards the young people's inclination to novelty？
Angry.
B. Disbelieving.
C. Objective and tolerant.
D. Pessimistic.
When mentioning the attitude of Prime Minister Tony Blair, some universities worry ______.
A. the future orientation of universities
B. the financial problems of universities
C. the influence of government's policy on universities
D. the purity of universities in its field of academe research
线粒体的生长发育是由两套遗传系统控制的，两套系统可以相互补偿，以便协调控制。
A. 正确
B. 错误
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