试题与答案

易并发中毒性巨结肠的疾病是() A.溃疡型肠结核 B.溃疡型结肠炎 C.Crohn病

题型:单项选择题

题目:

易并发中毒性巨结肠的疾病是()

A.溃疡型肠结核

B.溃疡型结肠炎

C.Crohn病

D.血吸虫病

E.增生型肠结核

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D解析:用15N标记的DNA分子连续在含14N的培养基上繁殖四代,得到子代DNA分子数为24=16个,根据DNA半保留复制特点可知,只含15N的DNA分子0个,含15N和14N的杂交DNA分子2个,只含14N的DNA分子14个。故选...

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Amy: Today is John's birthday. Let's give him a gift (礼物).

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