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【单选题】
若有如下定义,且sizeof(int)=4,则变量x在内存中需要的字节数是( )。 struct worker {char name[17]; int age; int score; }x;
A.
17
B.
21
C.
25
D.
4
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皮皮学刷刷变学霸
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【简答题】固体培养基是在液体培养基中加入2%~3%的 ,加热溶化经冷却凝固后即成。
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【单选题】Which statment is not correct description about the Na+---K+ pump?
A.
Na+--K+ pump is ATPase.
B.
It pumps K+ intothe cell and  Na+ out of the cell.
C.
Na+--K+ pump is a transmembrane protein complex.
D.
It pump Na+ and K+ along their concentrayion gradient.
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【单选题】以下叙述错误的是
A.
培养基按其物理性状可分为固体、半固体、液体3类
B.
根据细菌在固体培养基上的生长特点，可将菌落分为S型、R型、M型3型
C.
细菌在液体培养基中可出现浑浊生长、沉淀生长和菌膜生长3种状态
D.
挑取一个菌落接种到另一培养基中培养称为纯培养
E.
在液体培养基中加入2％～3%琼脂，即为半固体培养基
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【单选题】设某消费者仅消费X、Y两种商品，其价格分别为8角、2元，已知达到消费者均衡时消费的X为5件，第5件提供的边际效用为28单位，则这时消费的最后一单位Y提供的边际效用为()
A.
20
B.
4
C.
70
D.
25
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【单选题】设某消费者仅消费X、Y两种商品，其价格分别为5角、1元，已知达到消费者均衡时消费的X为5件，第5件提供的边际效用为28单位，则这时消费的最后一单位Y提供的边际效用为()
A.
20
B.
56
C.
70
D.
25
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【单选题】使用辛烷值较高的汽油时，应将点火时间略为（）
A.
提前
B.
点火线圈
C.
不变
查看完整题目与答案
【判断题】对于年轻游客在用于上要注意称呼,要有礼貌,对名胜古迹要作详细介绍,并重复。( )
A.
正确
B.
错误
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【单选题】The Na + /K + pump ( )
A.
moves 3 K + in and 2 Na + out each cycle.
B.
moves 2 K + in and 3 Na + out each cycle.
C.
moves 3 K + in and 3 Na + out each cycle.
D.
moves 2 K + in and 2 Na + out each cycle.
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【多选题】How does the Na + pump undergo a series of conformational changes as it exchanges Na + ions for K + ?
A.
The binding of cytosolic Na + (1) and the subsequent phosphorylation by ATP of the cytosolic face of the pump (2) induce the protein to undergo conformational changes that transfer the Na + across the membrane and release it outside the cell (3).
B.
The high-energy linkage of the phosphate to the protein provides the energy to drive the conformational changes.
C.
The binding of K + from the extracellular space (4) and the subsequent dephosphorylation (5) allow the protein to return to its original conformation, which transfers the K + across the membrane and releases it into the cytosol (6).
D.
The real pump in mammalian cells contains three binding sites for Na + and two for K + . The net result of one cycle of the pump is therefore the transport of three Na + out and two K + in. Ouabain inhibits the pump by preventing K + binding (4).
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【单选题】设某消费者仅消费X、Y两种商品，其价格分别为每单位1元、2元，已知达到消费者均衡时消费最后一单位的Y边际效用为20，则这时消费的最后一单位X的边际效用大约为()
A.
20
B.
10
C.
40
D.
25
查看完整题目与答案
相关题目：
【简答题】固体培养基是在液体培养基中加入2%~3%的 ,加热溶化经冷却凝固后即成。
查看完整题目与答案
【单选题】Which statment is not correct description about the Na+---K+ pump?
A.
Na+--K+ pump is ATPase.
B.
It pumps K+ intothe cell and  Na+ out of the cell.
C.
Na+--K+ pump is a transmembrane protein complex.
D.
It pump Na+ and K+ along their concentrayion gradient.
查看完整题目与答案
【单选题】以下叙述错误的是
A.
培养基按其物理性状可分为固体、半固体、液体3类
B.
根据细菌在固体培养基上的生长特点，可将菌落分为S型、R型、M型3型
C.
细菌在液体培养基中可出现浑浊生长、沉淀生长和菌膜生长3种状态
D.
挑取一个菌落接种到另一培养基中培养称为纯培养
E.
在液体培养基中加入2％～3%琼脂，即为半固体培养基
查看完整题目与答案
【单选题】设某消费者仅消费X、Y两种商品，其价格分别为8角、2元，已知达到消费者均衡时消费的X为5件，第5件提供的边际效用为28单位，则这时消费的最后一单位Y提供的边际效用为()
A.
20
B.
4
C.
70
D.
25
查看完整题目与答案
【单选题】设某消费者仅消费X、Y两种商品，其价格分别为5角、1元，已知达到消费者均衡时消费的X为5件，第5件提供的边际效用为28单位，则这时消费的最后一单位Y提供的边际效用为()
A.
20
B.
56
C.
70
D.
25
查看完整题目与答案
【单选题】使用辛烷值较高的汽油时，应将点火时间略为（）
A.
提前
B.
点火线圈
C.
不变
查看完整题目与答案
【判断题】对于年轻游客在用于上要注意称呼,要有礼貌,对名胜古迹要作详细介绍,并重复。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】The Na + /K + pump ( )
A.
moves 3 K + in and 2 Na + out each cycle.
B.
moves 2 K + in and 3 Na + out each cycle.
C.
moves 3 K + in and 3 Na + out each cycle.
D.
moves 2 K + in and 2 Na + out each cycle.
查看完整题目与答案
【多选题】How does the Na + pump undergo a series of conformational changes as it exchanges Na + ions for K + ?
A.
The binding of cytosolic Na + (1) and the subsequent phosphorylation by ATP of the cytosolic face of the pump (2) induce the protein to undergo conformational changes that transfer the Na + across the membrane and release it outside the cell (3).
B.
The high-energy linkage of the phosphate to the protein provides the energy to drive the conformational changes.
C.
The binding of K + from the extracellular space (4) and the subsequent dephosphorylation (5) allow the protein to return to its original conformation, which transfers the K + across the membrane and releases it into the cytosol (6).
D.
The real pump in mammalian cells contains three binding sites for Na + and two for K + . The net result of one cycle of the pump is therefore the transport of three Na + out and two K + in. Ouabain inhibits the pump by preventing K + binding (4).
查看完整题目与答案
【单选题】设某消费者仅消费X、Y两种商品，其价格分别为每单位1元、2元，已知达到消费者均衡时消费最后一单位的Y边际效用为20，则这时消费的最后一单位X的边际效用大约为()
A.
20
B.
10
C.
40
D.
25
查看完整题目与答案