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【多选题】
非竞争性抑制作用与竞争性抑制作用的不同点,在于前者的A.
Km值增加
B.
抑制剂与底物结构相似
C.
Km值不变
D.
抑制剂与酶活性中心外的基团结合
E.
提高底物浓度Vmax仍然降低
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举一反三
【单选题】Which of the following is true according to the passage?
A.
The goalmouth is equal to the weapon in hunting
B.
Without hunting our forefathers couldn't live
C.
After our forefathers became farmers, they still hunted for food
D.
Farmers are satisfied with stable lives, and they didn't have enthusiasm for hunting any more
【单选题】Alfred the Great was the king of ________.
A.
Wessex
B.
Essex
C.
Great Britain
D.
Wales
【单选题】关于逻辑判断,以下说法正确的是__________。
A.
通常我们用逻辑值“真”或“假”表示条件“满足”或“不满足”。
B.
在高级程序设计语言中（比如：Python语言），通常允许用数值充当逻辑值。
C.
比较运算的运算量可以是多种数据类型，而结果是逻辑值。
D.
A、B、C都对。
【单选题】利用根瘤农杆功制备转基因植物 的主要步骤包括:
A.
先构建含有目的基因的载体,然后将载体转入根瘤农杆菌;
B.
将要感染的植物形成伤口,便于根瘤农杆菌的感染或培养植物细胞;
C.
将根瘤农杆菌与植物器官或植物细胞共培养一段时间,实现根瘤农杆菌的感染;
D.
筛选阳性植物或细胞
【简答题】盆景制作常用树木种类有：松柏类、观花类、（）类、观叶类、杂木类、藤木类和花草类。
【单选题】Which of the following is true of the heating system of the Johnstown campus?
A.
The heat is supplied by human bodies only.
B.
The heat is supplied by both human bodies and other heat-emitting objects.
C.
The heat is supplied by both human bodies and conventional fuel.
D.
The heat is supplied by human bodies, other heat-emitting objects, and con-ventional fuel.
【单选题】Which of the following is NOT true about the 'rejection phase'?
A.
The newcomer is stressed but positive.
B.
The newcomer pays much attention to the negative sides of life.
C.
The newcomer refuses to accept the host culture.
D.
If the newcomer is not strong-willed enough, he may not be able to survive this stage successfully.
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