_______________ 20, we don’t care what the world is thinking about us.
A.At the age of
B. in the age
C. on the age of
D. the age of
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She had _______________ a full-time job as an English teacher.
A. applied for
B. asked for
C. required for
D. required
在pH 10的谷氨酸溶液中,下列哪一种结构占优势
A. 羧基,氨基都不解离
B. 羧基,氨基都解离
C. 只有α-羧基解离
D. α-羧基和γ-羧基都解离
下列氨基酸中,属于天然氨基酸的是
A. Cit
B. Pro
C. Ply
D. Hypro
下列蛋白质组分中,哪一种氨基酸在280nm具有最大的光吸收
A. 色氨酸
B. 酪氨酸
C. 半胱氨酸
D. 苯丙氨酸