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【单选题】
当植物因吸收不到水分而发生萎蔫时土壤含水量叫萎蔫系数(或凋萎系数),它包括全部吸湿水和部分膜状水,是植物可利用土壤有效水分的 限。
A.
上
B.
下
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参考答案：
举一反三
【单选题】十字链表顶点的节点结构有___个字段。
A.
2
B.
3
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【多选题】Why is the chemiosmotic mechanism for ATP synthesis called oxidative phosphorylation?
A.
The chemiosmotic generation of energy begins when the activated carriers NADH and FADH 2 donate their electrons to the electron-transport chain in the inner mitochondrial membrane, becoming oxidized to NAD + and FAD, respectively, in the process.
B.
The electrons are quickly passed along the chain to molecular oxygen (O 2 ) to form water (H 2 O). The stepwise movement of these electrons through the components of the electron-transport chain releases energy that can then be used to pump protons across the inner mitochondrial membrane .
C.
The resulting proton gradient, in turn, is used to drive the synthesis of ATP. The inner mitochondrial membrane thus serves as a device that converts the energy contained in the high-energy electrons of NADH (and FADH 2 ) into the phosphate bond of ATP molecules.
D.
This chemiosmotic mechanism for ATP synthesis is called oxidative phosphorylation because it involves both the consumption of O 2 and the addition of a phosphate group to ADP to form ATP.
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【单选题】Last month I came to Britain. My English has improved a lot _____ I use it all the time. [     ]
A.
since
B.
while
C.
when
D.
as
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【单选题】潘女士,28岁,停经50天后右下腹撕裂样疼痛约30分钟,伴恶心、呕吐、肛门坠胀感,怀疑输卵管妊娠破裂,最简便可靠的诊断方法是
A.
尿HCG测定
B.
阴道后穹窿穿刺
C.
刮宫术，子宫内膜送病理检查
D.
B超检查
E.
急查血常规
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【简答题】化学渗透学说( Chemiosmotic theory)
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【单选题】Since joining the European Economic Community in ______, Britain has adopted the Community system of agricultural support.
A.
1973
B.
1974
C.
1975
D.
1976
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【单选题】名词解释：chemiosmotic coupling
A.
化学渗透偶联学说
B.
氧化还原电位
C.
细胞色素c氧化酶
D.
氧化磷酸化
查看完整题目与答案
【单选题】潘女士,28岁,停经50天后右下腹撕裂样疼痛约30分钟,伴恶心呕吐、肛门坠胀感,怀疑输卵管妊娠破裂,最简便可靠的检查方法是
A.
尿HCG测定
B.
阴道后穹隆穿刺
C.
刮宫术，子宫内膜送病理检查
D.
B超检查
E.
急查血常规
查看完整题目与答案
【多选题】How did chemiosmotic processes evolve in stages?
A.
The first stage might have involved the evolution of an ATPase (pump) that pumped protons out of the cell using the energy of ATP hydrolysis. Such a proton pump could have been the ancestor of present-day ATP synthases.
B.
Stage 2 could have involved the evolution of a different proton pump, driven by an electron-transport chain. Indeed, some present-day bacteria that grow on formic acid use the small amount of redox energy derived from the transfer of electrons from formic acid to fumarate to pump H + .
C.
Stage 3 could then link these two systems together to generate an ATP synthase that uses the protons pumped by the electron-transport chain to synthesize ATP.
D.
An early cell with this final system would have had a large selective advantage over cells with neither of the systems or only one.
查看完整题目与答案
【简答题】说明IAA极性运输的化学渗透模型(chemiosmotic model)要点。
查看完整题目与答案
相关题目：
【单选题】十字链表顶点的节点结构有___个字段。
A.
2
B.
3
查看完整题目与答案
【多选题】Why is the chemiosmotic mechanism for ATP synthesis called oxidative phosphorylation?
A.
The chemiosmotic generation of energy begins when the activated carriers NADH and FADH 2 donate their electrons to the electron-transport chain in the inner mitochondrial membrane, becoming oxidized to NAD + and FAD, respectively, in the process.
B.
The electrons are quickly passed along the chain to molecular oxygen (O 2 ) to form water (H 2 O). The stepwise movement of these electrons through the components of the electron-transport chain releases energy that can then be used to pump protons across the inner mitochondrial membrane .
C.
The resulting proton gradient, in turn, is used to drive the synthesis of ATP. The inner mitochondrial membrane thus serves as a device that converts the energy contained in the high-energy electrons of NADH (and FADH 2 ) into the phosphate bond of ATP molecules.
D.
This chemiosmotic mechanism for ATP synthesis is called oxidative phosphorylation because it involves both the consumption of O 2 and the addition of a phosphate group to ADP to form ATP.
查看完整题目与答案
【单选题】Last month I came to Britain. My English has improved a lot _____ I use it all the time. [     ]
A.
since
B.
while
C.
when
D.
as
查看完整题目与答案
【单选题】潘女士,28岁,停经50天后右下腹撕裂样疼痛约30分钟,伴恶心、呕吐、肛门坠胀感,怀疑输卵管妊娠破裂,最简便可靠的诊断方法是
A.
尿HCG测定
B.
阴道后穹窿穿刺
C.
刮宫术，子宫内膜送病理检查
D.
B超检查
E.
急查血常规
查看完整题目与答案
【简答题】化学渗透学说( Chemiosmotic theory)
查看完整题目与答案
【单选题】Since joining the European Economic Community in ______, Britain has adopted the Community system of agricultural support.
A.
1973
B.
1974
C.
1975
D.
1976
查看完整题目与答案
【单选题】名词解释：chemiosmotic coupling
A.
化学渗透偶联学说
B.
氧化还原电位
C.
细胞色素c氧化酶
D.
氧化磷酸化
查看完整题目与答案
【单选题】潘女士,28岁,停经50天后右下腹撕裂样疼痛约30分钟,伴恶心呕吐、肛门坠胀感,怀疑输卵管妊娠破裂,最简便可靠的检查方法是
A.
尿HCG测定
B.
阴道后穹隆穿刺
C.
刮宫术，子宫内膜送病理检查
D.
B超检查
E.
急查血常规
查看完整题目与答案
【多选题】How did chemiosmotic processes evolve in stages?
A.
The first stage might have involved the evolution of an ATPase (pump) that pumped protons out of the cell using the energy of ATP hydrolysis. Such a proton pump could have been the ancestor of present-day ATP synthases.
B.
Stage 2 could have involved the evolution of a different proton pump, driven by an electron-transport chain. Indeed, some present-day bacteria that grow on formic acid use the small amount of redox energy derived from the transfer of electrons from formic acid to fumarate to pump H + .
C.
Stage 3 could then link these two systems together to generate an ATP synthase that uses the protons pumped by the electron-transport chain to synthesize ATP.
D.
An early cell with this final system would have had a large selective advantage over cells with neither of the systems or only one.
查看完整题目与答案
【简答题】说明IAA极性运输的化学渗透模型(chemiosmotic model)要点。
查看完整题目与答案
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