A.衰老细胞的细胞膜通透性改变,物质运输能力降低,部分酶活性下降 |
B.基因KAT7的表达产物的多少,可以作为细胞衰老程度的判断依据之一,衰老细胞中存在较多 KAT7 基因,年轻细胞中不含该基因 |
C.被小分子化合物激活的人体干细胞,细胞周期变短,细胞呼吸等代谢活动增强 |
D.个体衰老的过程是组成个体的细胞普遍衰老的过程,正常的细胞衰老有利于机体更好地实现自我更新 |
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同类型试题
![](http://static.xuejinqu.com/images/medal.png)
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)