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【判断题】
凡能与托伦试剂发生反应的一定是醛。A.
正确
B.
错误
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反馈参考答案：
举一反三
【简答题】实验分析：
某蛋白Fn可能与细胞的铁元素代谢（即细胞对铁的吸收、储存或排放）有关。为了研究它的功能，进行了以下实验：
首先将编码Fn的cDNA克隆到真核细胞的表达载体上，且载体的启动子受到四环素的激活，即只有加入四环素时，克隆的基因才表达。将克隆有Fn的cDNA的载体转染到细胞中，用含有柠檬酸亚铁的培养液培养细胞，并进行了两个实验。
实验1：将转染细胞平均分配到两个培养盘中，一盘加入...
【简答题】Erica: Hi, Daniel. What’s your plan for your future? Daniel: I would like to ___________________. Erica: What business will you do? Daniel: As you know, I _________________ software engineerin...
【简答题】So the man left France, _______ to give up the fortune that would one day come to him, _______ t35. So the man left France, _______ to give up the fortune that would one day come to him, _______ to li...
【单选题】So little ________ about science that the lecture was my understanding.A．I know; overB．knew I; b
A.
35. So little ________ about science that the lecture was my understanding. A．I know; over
B.
knew I; beyond
C.
did I know; beyond
D.
did I know; over
【简答题】Playing is serious business for children. In fact, it’s what they do best! Ask them why they do it, and kids will probably say, “Because it’s fun!” But it’s much more than that. It’s also good for the...
【单选题】Cyrus is so successful that she made Forbes’ Celebrity 100 list last year ___she was number 35.
A.
where
B.
when
C.
which
D.
That
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