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【单选题】
The gel below illustrates the purification of the RecA protein from E. coli. This gel was loaded from the top. Which statement BEST describes how proteins “run” in an SDS gel?A.
The proteins are separated primarily by molecular weight—the largest MW proteins are on the bottom, and the smallest are on the top.
B.
The proteins are separated primarily by molecular weight—the smallest MW proteins are on the bottom, and the largest are on the top.
C.
The proteins are separated primarily by charge—the protein with the smallest pI is on the top, and the protein with the largest pI is on the bottom.
D.
The proteins are separated primarily by charge—the protein with the largest pI is on the top, and the protein with the smallest pI is on the bottom.
E.
The proteins are separated primarily by their propensity to precipitate—as electrophoresis progresses, the heat generated by the current denatures proteins faster or slower. The slowest to denature is on the bottom, and the fastest to denature is on the top.
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【单选题】下列关于腹痛的叙述，哪项是错误的
A.
空腔脏器的痉挛或扩张可引起腹痛
B.
腹膜的化学刺激可引起腹痛
C.
腹腔内血管阻塞可引起缺血性腹痛
D.
腹痛均因腹腔内脏病变所致
E.
腹痛原因未明确之前不宜用止痛药
【多选题】oracle日志管理分为归档模式和非归档模式,如何查看oracle目前的日志管理模式呢?
A.
select log_mode from v$log
B.
select log_mode from v$database
C.
archive log list
D.
select log_mode from v$logfile
【简答题】税务会计对企业发展有什么意义?
【简答题】25 °C 将电导率为 0.14S·m -1 的 KCl 溶液装入一电导池中,测得其电阻为 525Ω 。在同一电导池中装入 0.1 mol·dm -3 的 NH 3 ·H 2 O 溶液,测得电阻为 2030Ω 。已知 NH 4 + 和 OH - 的极限摩尔电导率分别为 73.5×10 -4 和 198×10 -4 ,计算 NH 3 ·H 2 O 的标准解离常数。
【简答题】25 °C 将电导率为 0.14S·m -1 的 KCl 溶液装入一电导池中,测得其电阻为 525W 。在同一电导池中装入 0.1 mol·dm -3 的 NH 3 ·H 2 O 溶液,测得电阻为 2030W 。利用表 7.3.2 中的数据计算 NH 3 ·H 2 O 的解离度 及解离常数。
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