作者a84539568 (Toro)
看板Biology
标题[问题] 普生问题
时间Wed Jun 27 00:10:38 2007
(1) Which of the following is (are) characteristic of a simple nervous system?
A) a nerve net such as is found in cnidarians B) nerve cell ganglia
C)having electrical impulses traveling in both directions D) both A and C
E) A,B and C
(2) After an action potential, the resting potential is restored by
A) the opening of sodium activation gates.
B) the opening of voltage-sensitive potassium channels and the closing of
sodium activation gates.
C) an increase in the membrane’s permeability to potassium and chloride
ions.
D) the delay in the action of the sodium-potassium pump.
E) the refractory period in which the membrane is hyperpolarized.
(3) Consider a field plot containing 200 kg of plant material. Approximately
how many kg of carnivore production can be supported?
A) 200 B)100 C)20 D)10 E)2
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