多项选择题

利用PSORT工具分析NCBI数据库中果蝇（Drosophila melanogaster）Cyp6a2基因编码蛋白质亚细胞定位，可能定位于（）细胞器中。
A、内质网
B、高尔基体
C、细胞核
D、过氧化物酶体

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单项选择题

党的十九大报告指出，从现在到二〇二〇年，是全面建成小康社会（）。
A、决战期
B、决胜期
C、关键期
D、攻坚期

单项选择题

The appropriate ligand is attached to the matrix of the column and a protein extract is run through the column. The only macromolecule that will attach to the column will be the one that binds to the ligand; all the other macromolecules will wash through the column. The column is then treated in such a manner that the ligand and the macromolecule will dissociate and the macromolecule will then elute off. Elution by inclusion of free ligand in buffer is common. Other methods of elution can be

A．lowering the pH of buffer
B．increasing or decreasing salt concentrations
C．decreasing the temperature of the column
D．all of these