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【判断题】
简谐运动的总能量与振幅的平方成正比只适用于弹簧振子。A.
正确
B.
错误
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反馈参考答案：
举一反三
【多选题】党的十九大以“四个伟大”集中宣示新时代我们党举什么旗、走什么路、以什么样的精神状态、担负什么样的历史使命、实现什么样的奋斗目标。“四个伟大”是指( )。
A.
伟大斗争
B.
伟大工程
C.
伟大事业
D.
伟大梦想
【简答题】lipid raft model
【多选题】How do transmembrane proteins form aqueous pores across the lipid bilayer to allow small, water-soluble molecules to cross the membrane?
A.
Some transmembrane proteins function as channels, forming aqueous pores across the lipid bilayer to allow small, water-soluble molecules to cross the membrane.
B.
Such channels cannot be formed by proteins with a single transmembrane α helix. Instead, they usually consist of a series of α helices that cross the bilayer a number of times.
C.
For many of these multipass transmembrane proteins, one or more of the membrane-spanning regions are amphipathic—formed from α helices that contain both hydrophobic and hydrophilic amino acid side chains. These amino acids tend to be arranged so that the hydrophobic side chains fall on one side of the helix, while the hydrophilic side chains are concentrated on the other side.
D.
In the hydrophobic environment of the lipid bilayer, α helices of this type pack side by side in a ring, with the hydrophobic side chains exposed to the hydrophobic lipid tails and the hydrophilic side chains forming the lining of a hydrophilic pore through the membrane.
【单选题】______________ residues of transmembrane proteins are commonly found at the lipid-water interface.
A.
Tyr and Trp
B.
Tyr and Arg
C.
Tyr and Lys
D.
Tye and Glu
【简答题】脂/水分配系数（lipid/water partition coefficient）
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