In a resting neuron, the inside of the cell is negatively charged mainly because of
a. negatively charged chloride ions inside the cell.
b. potassium ions being pumped out of the cell.
c. negatively charged proteins inside the cell.
Answer: c. negatively charged proteins inside the cell.
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How do myelin sheaths increase the speed with which action potentials are propagated along an axon?
A) They increase the permeability of Na+ ions in the plasma membrane. B) They amplify the action potential by increasing sodium influx along the entire distance of the neuron. C) They cause action potentials to "jump" down the axon rather than travel in a continuous path along every site on the axon.
A flower develops from the end of the floral shoot, called the receptacle
a. True b. False
Photoperiodism is the
a. duration of flowering in a plant. b. amount of light needed by a plant to exhibit normal growth. c. biological response of a plant to a change in the length of daylight relative to darkness. d. light phase of photosynthesis during which photolysis of water occurs. e. time of the day when light shines.
In terms of public health, the major lethal effect of smoking is ________
A) lung cancer B) oral-facial cancer C) peptic ulcers D) cardiovascular disease