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【判断题】
乙炔分子中有丙个π键,π电子云密度比烯烃大,所以更容易发生亲电加成反应。( )A.
正确
B.
错误
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举一反三
【简答题】下列属于商品租金，却不属于成本租金的是（ ）。
【单选题】We can infer from the passage that we may cure addiction by
A.
scanning Of brain as often as possible.
B.
consciously practicing cognitive skills.
C.
going through intensive rehabilitation programs.
D.
making the neurotransmitter less sensitive.
【单选题】After the neuro-skeletal muscle junction has completed the information transmission, the enzyme that can eliminate the neurotransmitter at the junction is
A.
Na + -K + -ATPase
B.
Acetylcholinesterase
C.
Adenylyl cyclase
D.
Phosphodiesterase
【多选题】Using acetylcholine as an example, explain how the same signal molecule can induce different responses in different target cells.
A.
Different cell types are configured to respond to the neurotransmitter acetylcholine in different ways.
B.
When a heart pacemaker cell is exposed to the neurotransmitter acetylcholine, its rate of firing decreases.
C.
When a salivary gland cell is exposed to the same signal, it secretes components of saliva, even though the receptors on both cell types are the same.
D.
In skeletal muscle, acetylcholine binds to a different receptor protein, causing the muscle cell to contract.
【简答题】We can infer from the passage that we may cure addiction by [A] scanning of brain as often as possible. [B] consciously practicing cognitive skills. [C] going through intensive rehabilitation programs...
【单选题】In response to binding a neurotransmitter, a postsynaptic cell can
A.
only open chemically gated ion channels, causing graded potentials known as fast synaptic potentials.
B.
only close ion channels via G proteins and second messenger systems, producing slow responses.
C.
only regulate protein synthesis and affect the metabolic activities of the postsynaptic cell.
D.
open chemically gated ion channels, causing graded potentials known as fast synaptic potentials and regulate protein synthesis and affect the metabolic activities of the postsynaptic cell.
E.
open chemically gated ion channels, causing graded potentials known as fast synaptic potentials, close ion channels via G proteins and second messenger systems, producing slow responses, and regulate protein synthesis and affect the metabolic activities of the postsynaptic cell.
【单选题】Glutamate decarboxylation gives rise to γ-aminobutyrate (GABA), an inhibitory neurotransmitter. Its underproduction is associated with ______________. GABA analogs are used in the treatment of epileps...
A.
diabetes
B.
epileptic seizures
C.
brain tumor
D.
migraine
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