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【单选题】
女性，15岁。上呼吸道感染后2出现颜面水肿，肉眼血尿，内生肌酐清除率下降，拟诊急性肾炎。化验：血红蛋白80g／L，患者贫血的原因可能是A.
缺铁
B.
骨髓抑制
C.
红细胞寿命缩短(破坏增多)
D.
潴留、血液稀释
E.
促红细胞生成素生成减少
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皮皮学刷刷变学霸
举一反三
【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.
【简答题】Distinguish between homogeneous and heterogeneous nucleation for the solidification of a pure metal.
【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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