氨基酸等电点(isoelectric point,pI)
氨基酸等电点(isoelectric point,pI)
氨基酸等电点(isoelectric point,pI)
A、If at is always equal to 0 and an is not equal to 0, then the point moves along a curve with varying speed.
B、If at is constant and an is not equal to 0, then the point moves along a curve with uniformly varying speed.
C、If at is not equal to 0 and an is always equal to 0, then the point moves along a curve with varying speed.
D、If at is not equal to 0 and an is always equal to 0, then the point moves along a straight line with constant speed.
A.结构域(domain) B.锌指结构(zinc finger) C.螺旋-环-螺旋(helix-loop-helix) D.β-转角(β-turn)
A.分子量大的分子最先洗脱下来 B.可用于蛋白质分子量的测定 C.分子量小的分子最先洗脱下来 D.主要根据蛋白质带电荷的多少而达到分离的目的
A.两个相邻的肽平面呈折扇式折叠 B.β角蛋白具典型的β-片层结构 C.是一种比较伸展的肽链结构 D.若干锯齿状肽链骨架平行或反平行排列,链间靠氢键维系
A.多肽链主链骨架羰基氧原子与N-H基氢原子形成氢键 B.脯氨酸和甘氨酸对a-螺旋的形成无影响 C.每个氨基酸残基沿螺旋中心轴旋转100°,向上平移1.5nm D.每隔3.6个氨基酸残基上升1圈
A.在α-碳原子上都结合有氨基或亚氨基 B.所有的α-碳原子都是不对称碳原子 C.组成人体的氨基酸除一种外都是L型 D.脯氨酸是惟一的一种亚氨基酸
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