regulated exocytosis pathway (调节型胞吐作用)

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• 胞吐作用（exocytosis）

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• By regulation，your cargo vessel must have（）.

  A . sufficient facilities for the crew to wash their clothes B . a wash basin in each room C . separate toilet facilities for engineers where their number exceeds six D . All of the above

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• 密度调节（regulation of density）

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• 胞吐（作用）（exocytosis）

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• You are not complying（）traffic regulations.

  A . to B . who C . on D . with

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• Fire protection regulations apply to those towing vessels（）.

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• Masters are（）to make themselves well acquainted with these regulations.

  A . binding B . bound C . bounded D . bounding

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• 英语REGULATOR指（）

  A . A、变送器 B . B、调节器 C . C、定位器 D . D、定值器

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• Google has a workplace with many rules and regulations.

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• OTC drugs are usually regulated by ________.

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• What type of organizational control system is regulated by norms?

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• up-regulation

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• A supervision B manipulation C regulation D coordination

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• Voltage regulation of short transmission lines depends:

  A．Only on line resistance B．Only on line inductance C．Only on line capacitance D．On line inductance and line resistance

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• 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. 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. 此题为多项选择题。

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