Tight junctions:
a. Set up a geography of the lipid layer of the cell and only let small molecules but not water pass through
b. Set up a geography of the membrane and let only water but not small molecules pass through
c. Set up a geography of membrane proteins but adhering junctions stop the water from passing through
d. Are protected by the strength of adhering junctions
e. Are made out of only one type of protein
Answer: d. Are protected by the strength of adhering junctions
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Plate tectonic theory is based on
a. a thermal convection model in which cool material in the earth's mantle rises and spreads laterally beneath the crustal plates. b. the idea that the earth's crust is fragmented into rigid crusts that are sinking slowly beneath crustal plates. c. the idea that coacervate formation causes continents to drift apart slowly on their crustal plates. d. observations that the sea floor is slowly spreading away from oceanic ridges due to thermal convection in the mantle. e. all of these.
The axon hillock in the presynaptic neuron fire based on temporal and spatial summation of inputs
a. true b. false
Capturing energy by animals is in effect a process that utilizes ________ and produces ________.
A. ATP; AMP B. nitrogen; H2O C. carbon dioxide; oxygen D. oxygen; carbon dioxide E. N2; carbon
Most commercial pesticides are effective for only 2 or 3 years because
A) the chemicals induce mutations that provide immunity. B) new pests invade the area. C) the chemicals mutate and become ineffective. D) the pests learn to hide when the chemicals are being applied. E) those pests born with mutations that provide immunity will survive and reproduce.