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【多选题】
判断一个纯化酶的方法优劣的主要依据是酶的
A.
酶蛋白的质量
B.
酶蛋白的总活力
C.
酶蛋白的比活力
D.
酶蛋白的酶单位
E.
酶蛋白的浓度
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参考答案：
举一反三
【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】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】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
【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】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
【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
【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】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】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】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】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
【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】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
【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
【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】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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