【简答题】It’s unnecessary to use formal expressions and you can say “hi” or “hello” to greet each other in a business meeting.
【判断题】It’s unnecessary to vary the length and structure of sentences within a paragraph.
【判断题】It’s unnecessary to use formal expressions and you can say “hi” or “hello” to greet each other in a business meeting.
【多选题】下面关于酶分子修饰描述正确的是:
D.
物理修饰不改变酶的组分和基团,酶分子中的共价键不发生改变
【判断题】It’s unnecessary to bring a gift when we visit an American family.
【单选题】下列关于酶的共价修饰的描述,正确的是
B.
通过打断某些肽键,使酶的活性中心形成而改变酶的活性
C.
只涉及酶的一级结构的改变而不涉及高级结构的改变