皮皮学，免费搜题
登录
搜题
【多选题】
关于钢材的力学性能与特点说法正确的是（ ）A.
钢材的抗冲击性能用冲击韧性指标表示
B.
钢材在交变荷载的反复作用下，在远小于抗拉强度时发生突然破坏，叫疲劳破坏
C.
钢的化学成份、组织状态、冶炼和轧制质量、温度和时效等因素对冲击韧性指标有明显影响
D.
硬度是金属材料抵抗硬的物体压陷表面的能力，是评价部件承受磨损作用的重要参数
E.
钢材疲劳强度是无限次交变荷载作用下发生突然断裂的最大强度
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】英译中（Translate）：chemiosmotic hypothesis（）
【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.
【单选题】Constitutional Monarchy was founded in Britain since ____________.
A.
Bill of Rights
B.
the Reformation
C.
the Restoration
D.
the Civil Wars
【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
【简答题】化学渗透学说( Chemiosmotic theory)
【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
【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.
相关题目：
参考解析：
知识点：
题目纠错 0
发布
