将一个细胞中的磷脂成分全部提取出来，并将其在空气﹣水界面上铺成单分子层，结果测得单分子层的表面积相当于原来细胞膜表面积的两倍．用下列细胞实验与此结果最相符的是_刷题宝

题干

将一个细胞中的磷脂成分全部提取出来，并将其在空气﹣水界面上铺成单分子层，结果测得单分子层的表面积相当于原来细胞膜表面积的两倍．用下列细胞实验与此结果最相符的是（）

A：人未成熟的红细胞

B：蛙的红细胞

C：洋葱鳞片叶表皮细胞

D：大肠杆菌

上一题下一题 0.0难度选择题更新时间:2019-09-07 09:45:29

答案(点此获取答案解析）

D

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有一台“造数”的机器，它的加工方式是“对输入的数加上2”后输出一个新数，然后再将输出的新数输入“造数”的机器，又“造”出一个新数，依次进行下去（如图所示）．如果开始输入的数是1，则第n次输出的数是____．

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产业革命前，世界人口增长缓慢，从根本上说是因为（）

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设N_A为阿伏加德罗常数,下列说法中正确的是

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若发生液氯泄漏，下列措施中错误的是

同类题5

People in the West didn't know coffee or tea two hundred years ago. They were 1 to drink them because they thought coffee or tea could kill a person. Once the king of England decided to find out 2 it was true.

There were two brothers in prison(监狱) at that time.They would be killed 3 a few days because they did wrong. The king said, "I shall let them live but they must drink coffee or tea to the end of their lives. One brother must drink coffee and 4 must drink tea every day." And they followed the king's words.

They both lived many years. At last, the elder brother died when he was eighty-three years old.The younger one died a few years later. After that, people 5 that coffee and tea were not bad to man.

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