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【简答题】
If A=[1,2,3,4;5,6,7,8],so A(2,4)*A(1,3)=(_);
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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.
0
D.
5
查看完整题目与答案
【简答题】钠-钾泵(Na+-K+ pump)
查看完整题目与答案
【单选题】The following description about Na + -K + pump is wrong
A.
Only distributed on the cell membrane of excitable cells
B.
is a protein embedded in the cell membrane
C.
Capable of decomposing ATP
D.
Can constantly move Na + out of the cell membrane and K + into the cell membrane
查看完整题目与答案
【单选题】The ATP-driven Na + pump plays such a central part in the energy economy of animal cells that it typically accounts for _____ or more of their total ATP consumption. This pump uses the energy derived ...
A.
10%
B.
20%
C.
30%
D.
40%
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3元、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27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.
18
C.
28
D.
8
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X边际效用为20,则这时消费的最后一单位Y的边际效用大约为( )
A.
20
B.
4
C.
40
D.
25
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
【判断题】零售企业在购进商品时因管理不善造成商品丢失等非常损失,这部分损失商品的增值税进项税额不得从销项税额中抵扣。 ( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Which of the following statements about the Na+/K+ pump is FALSE?
A.
It transports Na+ out of the cell and K+ into the cell.
B.
It is present in neurons.
C.
Its activity requires the expenditure of metabolic (cellular) energy.
D.
It transports Na+ and K+ in a 1:1 ratio.
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
相关题目：
【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.
0
D.
5
查看完整题目与答案
【简答题】钠-钾泵(Na+-K+ pump)
查看完整题目与答案
【单选题】The following description about Na + -K + pump is wrong
A.
Only distributed on the cell membrane of excitable cells
B.
is a protein embedded in the cell membrane
C.
Capable of decomposing ATP
D.
Can constantly move Na + out of the cell membrane and K + into the cell membrane
查看完整题目与答案
【单选题】The ATP-driven Na + pump plays such a central part in the energy economy of animal cells that it typically accounts for _____ or more of their total ATP consumption. This pump uses the energy derived ...
A.
10%
B.
20%
C.
30%
D.
40%
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3元、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27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.
18
C.
28
D.
8
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X边际效用为20,则这时消费的最后一单位Y的边际效用大约为( )
A.
20
B.
4
C.
40
D.
25
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
【判断题】零售企业在购进商品时因管理不善造成商品丢失等非常损失,这部分损失商品的增值税进项税额不得从销项税额中抵扣。 ( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Which of the following statements about the Na+/K+ pump is FALSE?
A.
It transports Na+ out of the cell and K+ into the cell.
B.
It is present in neurons.
C.
Its activity requires the expenditure of metabolic (cellular) energy.
D.
It transports Na+ and K+ in a 1:1 ratio.
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
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