Before another action potential “spike” can occur
a. there must be a very brief restoration of the
resting conditions in the membrane.
b. the membrane voltage must drop to zero.
c. the sodium-potassium pump must cease
temporarily.
d. all of the membrane gates must be closed at the
same time.
e. all of these must happen.
Answer: a
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Numerous hypotheses have been proposed for the mass extinction of about 60% of all species, including nearly all the dinosaurs, about 65 million years ago. Evidence has been found of the impact of a large meteor at about the time of this mass extinction. The amount of dust and debris put into the atmosphere upon impact, as well as atmospheric heating, would have been enormous. Using your knowledge of photosynthesis, speculate about why the dinosaurs subsequently became extinct.
What will be an ideal response?
Which of the following is unique to prokaryotes?
a. chemoautotroph b. chemoheterotroph c. photoautotroph d. photoheterotroph e. chemoautotroph and photoheterotroph
The female gametophyte in flowering plants forms in a
a. calyx. b. carpel. c. receptacle. d. corolla. e. stamen.
What type of plant is corn?
a. C3 b. C4 c. CAM d. it becomes a CAM plant if grown in the desert e. it becomes a C3 plant if grown in cold climates