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【单选题】
凝胶层析分离蛋白质的依据是
A.
蛋白质的两性解离性质
B.
蛋白质的紫外吸收性质
C.
蛋白质的分子大小不同
D.
蛋白质溶液为亲水胶体
E.
蛋白质分子中氨基酸连接键为肽键
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参考答案:
举一反三
【单选题】基因分离定律的实质是
A.
等位基因随同源染色体分开而分离
B.
子一代性状分离比例为3∶1
C.
子一代出现性状分离
D.
测交后代性状分离比为3∶1
【简答题】什么是人口老龄化,我国人口老龄化的主要特点是什么?
【单选题】The most gifted students do ( ) perform best in exams.
A.
counts for
B.
gifted
C.
not necessarily
D.
make the most of
E.
brains
【简答题】由椰壳纤维35%、纤维20%、羊毛纤维45%的未漂白机织物(幅宽超过30厘米)
【简答题】The most gifted students do not necessarily perform. best in exams. It counts for more to know how to make the most of one's abilities.
【简答题】简述我国人口老龄化的主要特点。
【简答题】The Academy numbers include the most gifted and skilled __ in the motion picture world.
【单选题】The main idea of the passage is______.
A.
that gifted children were most likely to become bright grown-ups
B.
that bright children were unlikely to be physically and mentally healthy
C.
how many gifted children turned successful when they grew up
D.
that when the bright children grew up, they would become ordinary
【多选题】2010年,我国老年人口将达到1.74亿,占总人口的12.8%。我国人口老龄化的主要特征有:()。
A.
未富先老
B.
老年人口数量多
C.
老龄化速度快
D.
高龄趋势明显
【单选题】分离定律的实质是
A.
子二代出现性状分离
B.
子二代性状分离比为3:1
C.
子二代性状分离比为1:1
D.
测交后代性状分离比1:1
E.
等位基因随同源染色体分离而分开
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