变性后的蛋白质其分子量也发生改变。
参考答案:错
解析:
因为它并没有发生化学变化,所以变性后的蛋白质其分子量不发生改变
具有回阳救逆、补火助阳、散寒止痛功效的药物是()
A.肉桂
B.干姜
C.吴茱萸
D.丁香
E.附子
— Where is the School English Speech Contest going to be held tonight?
— I’m not sure. Is it in the hall _____ can hold 300 people?
A.where
B.what
C.that
D.when