1.请问糖类α-form 和β-form为什麽可以变旋用相互转换形式? α-form的OH基在下 β-form的OH基在上 但C1还另外接了H.C2和O 这样C1并不是单键 怎麽能任意旋转?(变旋) 有人听得懂我的意思吗@@ 2.A prediction is: a.Only possible after a hypothesis has been proposed b.The logical consquence of a hypothesis c.A possible consequence of a hypothesis d.The consequence of an inductive leap Ans:b c预测是假说可能的结果 也说的通? 3.Prokaryotic-type ribosome are NOT associated with ____. a.RER b.bacterial cells c.plastids d.mitochondria e.any of these Ans:a 原核无膜围的胞器 与abcd都没有关联...?! 4.Which of the following elements occurs significantly in animals(>1%) but is only a trace element in plants? a.Sodium b.Magnesium c.Carbon d.Nitrogen e.Cobalt Ans:d 植物体需求较多C.H.O.N.Ca.Mg.P.K.S 较少B.Zn.Fe.Mn.Cu.Cl 那答案怎是N? 5.When elongated,tube-shaped cells from the lining of the intestine are treated with a certain chemical;the cells sag and become round blobs. The internal structures disrupted by this chemical are probably ____. a.call junction b.microtubules c.RER d.mitochondia e.dynein Ans:b 题目是这个意思吗?---小肠内衬的长型管状细胞吸收特定化学物质後,会陷落形成一 圆滴,小肠内部结构会被啥化学物质打断?--- 小肠细胞内主要不是微丝和中间丝吗? 6.A nucleolus is: a.A small nucleus in a newly formed cell b.A small second nucleus in some protest cells c.A differentially staining nuclear inclusion that makes ribosomal RNA d.A rigion of the chromosome encoding ribosomal RNA genes e.The non-membrane-bound region of the prokarytic cell that contains the nucleic acis Ans:c 请问c.rRNA是由"核仁"制造吗? 记得 rRNA是由"细胞核"(?)制造 再送进核仁组成ribosome大小次单位? 7.Which one of the following five membrane is most likely to have a lipid composition that is distinct from the other four? a.ER b.plasma membrane c.mitochondrial outer membrane d.lysosome membrane e.Golgi apparatus Ans:c 请问答案选c 是由於它不属质膜系统吗? 是不是有可能是"mt的外膜大分子可自由进出,与其他双层膜的性质不同"? 另外 请教一下 为什麽叶绿体与粒线体的外膜大分子可自由进出 不受磷脂双层限制呢?? 8.Which of the folloeing is NOT a true statement about chloroplasts and mitochondria? a.Each contains a small amount of DNA b.Neither are components of endomembrane system c.Both are composed of two separate membranes d.Each organelles synthesizes some of its own proteins e.All of the above are correct Ans:c 我选的是e...c.两者皆有两层分开的膜...没错阿@@ = = " 糟 问题挺多 先谢谢看完的人~~thx --

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