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【单选题】
循环系统疾病引起呼吸困难最常见的病因()A.
衰竭
B.
右心衰竭
C.
心包积液
D.
心肌炎
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举一反三
【多选题】Why is ATP-driven Na + or H + important?
A.
In the plasma membrane of an animal cell, an ATP-driven Na + pump transports Na + out of the cell against its electrochemical gradient; this Na + can then flow back into the cell, down its electrochemical gradient, through various Na + gradient-driven pumps.
B.
The influx of Na + through these gradientdriven pumps provides the energy for the active transport of many other substances into the cell against their electrochemical gradients. If the ATP-driven Na + pump ceased operating, the Na + gradient would soon run down, and transport through Na + gradient-driven pumps would come to a halt.
C.
For this reason, the ATP-driven Na + pump has a central role in the active transport of small molecules across the plasma membrane of animal cells.
D.
Plant cells, fungi, and many bacteria use ATP-driven H + pumps in an analogous way: in pumping H + out of the cell, these proteins create an electrochemical gradient of H+ across the plasma membrane that is subsequently harnessed for solute transport.
【单选题】The various pumps and lines are _____ to some extent so that each pump can act as an alternative for another.
A.
interlocked
B.
interconnected
C.
interfered
D.
interacted
【简答题】表征某工程项目 ,反映引进工程其他建设费用的预算表格是 。
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