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发布时间：2022-01-07
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对于石芽密布地基的变形问题，目前已经能够从理论上进行计算。（)
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第6题
按下述方法进行实验会发生爆炸的是()
A．经验纯后，将氢气点燃，然后把导管插入盛有氯气的集气瓶
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B．CO 与空气充分混合后点燃
C．用 H 2 还原 CuO 时，将装有 CuO 的试管加热，然后通入 H 2
D．H 2 与 N 2 混合后用火点燃
第7题
How do GPCRs regulate intracellular cyclic AMP levels?
A．Many?extracellular?signals?acting?via?GPCRs?affect?the?activity?of?the?enzyme?adenylyl?cyclase?and?thus?alter?the?intracellular?concentration?of?the?second?messenger?molecule?cyclic?AMP.
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B．Most?commonly,?the?activated?G?protein?α?subunit?switches?on?the?adenylyl?cyclase,?causing?a?dramatic?and?sudden?increase?in?the?synthesis?of?cyclic?AMP?from?ATP.
C．To?help?terminate?the?signal,?a?second?enzyme,?called?cyclic?AMP?phosphodiesterase,?rapidly?converts?cyclic?AMP?to?ordinary?AMP.?Cyclic AMP phosphodiesterase is continuously active inside the cell. Because it eliminates cyclic AMP so quickly, the cytosolic concentration of this second messenger can change rapidly in response to extracellular signals, rising or falling tenfold in a matter of seconds.
D．Cyclic AMP is water-soluble,so it can, in some cases, carry the signal throughout the cell, traveling from the site on the membrane where it is synthesized to interact with proteins located in the cytosol, in the nucleus, or on other organelles. One?way?that?caffeine?acts?as?a?stimulant?is?by?inhibiting?this?phosphodiesterase?in?the?nervous?system,?blocking?cyclic?AMP?degradation?and?thereby?keeping?the?concentration?of?this?second?messenger?high.
