从分子水平上看,细胞分化的实质是()。
A. 特异性蛋白质的合成
B. 基本蛋白质的合成
C. 结构蛋白质的合成
D. 酶蛋白的合成
E. 以上都不是
细胞分化是()的结果。
A. DNA复制水平的调控
B. 选择性转录
C. 翻译水平的调控
D. 转录和翻译水平上同时发生的调控
E. 以上都不是
What do we learn from the last paragraph? 查看材料
A. The aging of population is becoming more and more serious in Britain.
B. The elderly often go to the Costa del Sol for their final years.
C. The older people in the nursing home can get protection from the government.
D. The government changes the policy to help people plan their later life.
The government issued the new policy with the purpose of
A. controlling the expensive insurance charges
B. warning the illegal insurance companies
C. predicting the care expenses accurately
D. helping the insurers to reduce the risks