第099章 -条件是为了报复男主(2 / 3)
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8:分别用sds-page和等电聚集测定蛋白质的大小和pi;使用northern印迹和rn印迹检测它是否在肝细胞中表达;使用x射线衍射或nmr测定它的三级结构。
第五章:
第六章
9:根据密码子和反密码子配对遵守反平行原则以及写碱基序列要按照从5到3的方向,此外ψ为假尿苷,与a配对,不难得出gψc识别的密码子序列应该是gac。
7.3:生活在南极的微生物在基因组的一级结构上会含有更多的at碱基对,三级结构为负超螺旋,生活在火山口的微生物在基因组的一级结构上应含有更多的gc碱基配对,三级结构很可能是正超螺旋,这样可以维持其基因组dna在高温环境下的稳定。
7.4:atatatatatat的均一性高,及复杂度更低,在复性的时候很容易找到互补链上的序列而重新配对。
7.8:变性后的dna浮力密度上升,因此位置将下移。
253.15:生活在南极的微生物的基因组dna富含at碱基对,并形成负超螺旋,因为这样有利于在低温下dna的解链;而生活在热泉中的微生物的基因组dna应富含gc碱基对,而且可能形成正超螺旋,因为这有助于在高温环境下基因组dna的稳定。
第一章
3:tyr的等电点是(2.29.1)/2=5.65,cys的等电点是(2.08.4)/2=5.2
4:如果选用阴离子交换层析,asp,lys和a在ph6的低盐缓冲溶液下上柱,那么带负电荷的asp将被吸附在树脂上,而带正电荷的lys和净电荷为零的a将直接出现在流出液中,asp会在随后的高盐缓冲溶液洗脱中得到,这样就实现了asp与lys和a的分离。如果还需要将lys和a分开,可以将收集到的直接流出液再进行阳离子交换层析。
第二章
5:(4)最稳定,因为这种a-螺旋n-端和c-端各有负电荷和带正电荷的侧链基团,可有效地中和由螺旋偶极矩带来的在n-端和c-端的正电荷和负电荷;(3)最不稳定,因为这种a-螺旋n-端和c-端各有正电荷和带负电荷的侧链基团,不仅不能中和由螺旋偶极矩带来的在n-端和c-端的正电荷和负电荷,反而增加了两端所带有的电荷、
6:出现在两相界面的氨基酸残基首先不应该是破坏螺旋的氨基酸残基,其次这种氨基酸的侧链比较大,并具有两亲性质——一个部分亲水,另一部分疏水。显然tyr和lys具有这样的性质。
11:第一应该是有利于形成a-螺旋的氨基酸;第二侧链应该是含有氢键供体或受体的氨基酸,这样有利于通过氢键去识别并结合特定的碱基序列;第三最好侧链带正电荷或不带负电荷,这样有利于和磷酸骨架的结合。符合这几个条件的氨基酸有lys,arg,gln,asn和tyr。
12:筛选一种药物可结合并能稳定的螺旋结构,阻止他们遇到以后发生构象变化。