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【单选题】
下列哪一种情况引起总需求曲线向右方移动?( )。A.
物价水平不变的时候利率上升
B.
预期的通货膨胀上升
C.
税收增加
D.
物价水平下降
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【多选题】How does tubulin polymerize from nucleation sites on a centrosome?
A.
Inside cells, microtubules grow from specialized organizing centers that control the location, number, and orientation of the microtubules.
B.
In most animal cells, for example, the centrosome—which is typically close to the cell nucleus when the cell is not in mitosis—organizes an array of microtubules that radiates outward through the cytoplasm. The centrosome consists of a pair of centrioles, surrounded by a matrix of proteins.
C.
The centrosome matrix includes hundreds of ringshaped structures formed from a special type of tubulin called γ-tubulin, and each γ-tubulin ring complex serves as the starting point, or nucleation site, for the growth of one microtubule.
D.
The αβ-tubulin dimers add to each γ-tubulin ring complex in a specific orientation, with the result that the minus end of each microtubule is embedded in the centrosome, and growth occurs only at the plus end that extends into the cytoplasm.
【单选题】图中a、b、c表示三种生物细胞的结构模式图。下列叙述正确的是 [ ]
A.
三种细胞内遗传物质的载体是染色体
B.
a细胞有细胞壁，而b、c细胞没有该结构
C.
各种细胞中共有的细胞器只有核糖体
D.
a、b细胞内具膜结构的细胞器构成了生物膜系统
【简答题】信息技术是一个综合的技术，()已成为支持信息技术的核心技术。 A)计算机与智能技术 B)传感技术 C)IP技术 D)网络技术
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