题目内容

Reading comprehension: What do freshmen do during Orientation Week at Victorian College?

A. They meet with their academic advisor.
B. They test their ability of speaking in public.
C. They learn what life is like on campus.
D. They enjoy music, dancing, and free pizza.
E. They play roles from movies or cartoons.

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氨基酸的结构通式是。

组成蛋白质分子的酸性氨基酸有，；碱性氨基酸有，，。

在下列空格中填入合适的氨基酸名称。(1)带芳香族侧链的极性氨基酸是；(2)带芳香族侧链的非极性氨基酸是和；(3)含硫的极性氨基酸是；(4)相对分子质量小且不含硫的氨基酸是或，在一个肽链折叠的蛋白质中它能形成内部氢键；(5)是在一些酶的活性中心中起作用并含羟基的极性较小的氨基酸。

氨基酸的等电点(pI)是指