皮皮学，免费搜题
登录
搜题
【判断题】
在分离DNA 时要使用金属离子螯合剂,如EDTA 和柠檬酸钠等,其目的是螯合Mg2+离子,抑制核酸酶的活性A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】BSG其最主要控制策略是___。
【单选题】The local historians believe that McDonald' real purpose is ___the history.
A.
rewrite
B.
rebuild
C.
to rewrite
【单选题】Historians using Model A believe that ______.
A.
history is a record of progress
B.
things are getting worse over time
C.
everyone currently alive is not able to rise above the level of people who are dead
【单选题】Historians using Model C believe that ______.
A.
progress is inevitable
B.
decay is inevitable
C.
periods of progress and achievement are followed by periods of decay
【简答题】Historians believe that the constitution was __________ by King Alexander.
【单选题】The author suggests which of the following about art historians?
A.
They do not believe that illusionist tricks have become trivial.
B.
They generally spend little time studying contemporary artists.
C.
They have not given enough consideration to how the representation of nature has become commonplace.
D.
They generally tend to argue about theories rather than address substantive issues.
相关题目：