When a neuron undergoes a change in membrane potential that is proportional to (i.e., varies depending on) the strength of the stimulus given to that neuron, this is referred to as a(n)
A. graded potential.
B. action potential.
C. reversal potential.
D. resting potential.
E. equilibrium potential.
Answer: A
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Scientists believe that stimulating the growth of algae and other organisms can reduce carbon dioxide amounts in the atmosphere. Where is carbon dioxide consumed in a plant cell?
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The time stretching from the emergence of Homo erectus until the dawn of human agriculture is called:
A. Holocene B. Pliocene C. Oligocene D. Pleistocene E. None of these.