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【多选题】
How are the glycogen degradative and synthetic pathways coordinated and regulated?A.
Fasting cells can mobilize glucose that has been stored in the form of glycogen, a branched polymer of glucose . This large polysaccharide is stored as small granules in the cytoplasm of many animal cells, but mainly in liver and muscle cells . The synthesis and degradation of glycogen occur by separate metabolic pathways, which can be rapidly and coordinately regulated to suit an organism’s needs.
B.
When more ATP is needed than can be generated from food-derived molecules available in the bloodstream, cells break down glycogen in a reaction that is catalyzed by the enzyme glycogen phosphorylase. This enzyme produces glucose 1-phosphate, which is then converted to the glucose 6-phosphate that feeds into the glycolytic pathway.
C.
Like glycolysis and gluconeogenesis, the glycogen degradative and synthetic pathways are coordinated by feedback regulation. In this case, enzymes in each pathway are allosterically regulated by glucose 6-phosphate, but in opposite directions: in the synthetic pathway, glycogen synthetase is activated by glucose 6-phosphate, whereas glycogen phosphorylase, which breaks down glycogen, is inhibited by glucose 6-phosphate, as well as by ATP.
D.
This regulation helps to prevent glycogen breakdown when ATP is plentiful and to favor glycogen synthesis when the glucose 6-phosphate concentration is high. The balance between glycogen synthesis and breakdown is further regulated by intracellular signaling pathways that are controlled by the hormones insulin, epinephrine, and glucagon.
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【多选题】阀控蓄电池在（）情况下应进行补充充电或均衡充电
A.
安装结束后，投入运行前需进行补充充电
B.
事故放电后，需要在短时间内充足蓄电池容量
C.
单格电池的浮充电压小于2.20V，需要进行均衡充电
D.
极板的颜色放电终了时需要进行补充充电
【简答题】在众多类型的打印机中，打印效果最佳的是________。Among many types of printers, the best one is________.
【简答题】在什么情况下蓄电池需要进行补充充电？
【单选题】互感器若压力表偏出( )正常压力区时,应引起注意,并及时按制造厂要求停电补充合格的SF6新气。一般应停电补气,个别特殊情况需带电补气时,应在厂家指导下进行。 ( A)黄色;(B)黑色;(C)红色;(D)绿色。
A.
B.
C.
D.
D
【单选题】在正常情况下,一般闭式系统泄漏的水靠热源处的补水装置进行补充。闭式系统容易监测网路系统的严密程度,( )大,就说明网路的漏水量大,需要及时检修维修。
A.
灰渣量
B.
耗煤量
C.
耗电量
D.
补水量
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