单项选择题

蛋白质变性是由于()。
A.氨基酸排列顺序的改变
B.氨基酸组成的改变
C.肽键的断裂
D.蛋白质空间构象的破坏

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单项选择题

Maria looked out of the restaurant window; it was still pouring outside. “I guess it won’t matter if I stay here a few more minutes,” she thought. “Maybe it will clear up soon.” Then she asked the waiter for another cup of coffee.
A、Maria had an appointment.
B、Maria hoped the rain would stop soon.
C、Maria had forgotten her umbrella.

不定项选择

为了提高浮选效率，应向料浆中加入活化剂而非抑制剂。

A．正确
B．错误