使用SDS分离DNA时,为什么要注意SDS的浓度
参考答案:0.1%和1%的sDs的作用效果是不同的。前者只将RNA分离出来,后者可将DNA与RNA一起分离出来。
阅读下列每个句子,根据空白处的汉语提示或首字母,填入适当词汇。每空仅限一词。
1. Wang Wei soon got them _____ (感兴趣) in cycling too.
2. He looks old, but _____ (事实上) he is in his 30's.
3. He offered guidance to poor black people on their _____ (法律) problems.
4. One of my new classmates comes from an _____ (非洲) country.
5. Our _____ (政府) is caring more about the poor and the weak.
6. This is s_____ news as we never expected him to lose the game.
7. The books will be t_____ to Yushu by truck.
8. Workers built s_____ for survivors whose homes had been destroyed.
9. Different people have different a_____ toward the same thing.
10. He always buys gifts for us. So he behaves g_____.
14岁女孩,半年来学习成绩下降,期中考试有一门功课不及格,受到父母责骂和同学歧视,渐渐情绪低落、恐慌、内疚、少言寡语、喜独处,思维渐迟钝。该女孩可能患()
A.多动症
B.精神分裂症
C.抑郁症
D.焦虑症
E.孤独症