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【判断题】
交流钨极氩弧焊机所用电源的空载电压一般要比手工电弧焊电源的空载电压高。A.
正确
B.
错误
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皮皮学刷刷变学霸
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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.
【简答题】Distinguish between homogeneous and heterogeneous nucleation for the solidification of a pure metal.
【简答题】"homogeneous nucleation"的中文表达是(__)。
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