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【简答题】
（10分）(1) 按系统命名法命名 ①有机物CH 3 CH(C 2 H 5 )CH(CH 3 ) 2 的名称是________________________。 ②在有机物分子中若某一个碳原子连接4个不同的原子或基团，则这种碳原子称为“手性碳原子”。C 7 H 16 的同分异构体中具有“手性碳原子”的有两种，名称分别为_____________ ___ ___________ ____ 。 (2) 写出下列各有机物的结构 ① 2，3－二甲基－4－已烷 _____________________________________ ②支链只有一个且式量最小的烷烃_____________________________
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皮皮学刷刷变学霸
举一反三
【单选题】下面说法正确的是
A.
若 在 处存在极限，则 在 处连续
B.
若 在 处无定义，则 在 处无极限
C.
若 在 处连续，则 在 处存在极限
D.
若 在 处连续，则 在 处可导
【简答题】创建建工墙体练习
【单选题】How many feedback resistors are found in a 3-input voltage summing circuit that is constructed around an op-amp?
A.
0
B.
1
C.
2
D.
3
【多选题】How do voltage-gated ion channels work?
A.
Voltage-gated ion channels have domains called voltage sensors that are extremely sensitive to changes in the membrane potential: changes above a certain threshold value exert sufficient electrical force on these domains to encourage the channel to switch from its closed to its open conformation.
B.
A change in the membrane potential does not affect how wide the channel is open, but instead alters the probability that it will open. Thus, in a large patch of membrane containing many molecules of the channel protein, one might find that on average 10% of them are open at any instant when the membrane is at one potential, whereas 90% are open after this potential changes.
C.
When one type of voltage-gated ion channel opens, the membrane potential of the cell can change. This in turn can activate or inactivate other voltage-gated ion channels.
D.
Such circuits, which couple the opening of ion channels to changes in membrane potential to the opening of additional ion channels, are fundamental to all electrical signaling in cells.
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