Which trend best describes the levels of atmospheric CO2 since the start of the Industrial Revolution?
a. gradual decrease
b. period fluctuations
c. steady increase
d. no apparent change
c. steady increas
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Organisms that produce all of their offspring in a single event are
A. always successful. B. never successful. C. autogenous. D. semelparous. E. iteroparous.
When Darwin covered the tip of a grass seedling with metal foil and then illuminated it from one side, what happened to the seedling?
A. It did not respond to the directional light. B. It waved back and forth. C. It wilted and died. D. It bent away from the directional light. E. It grew toward the light, as expected.
In the figure above, the animals colored green in the lower left represent:
a) the reproductive output of the dominant male elephant seal. b) the male offspring of a colony of elephant seals. c) the reproductive output of the low-ranking male elephant seals. d) are the female elephant seals that will mate with the blue males. e) the next generation of dominant male elephant seals.
Rothman and colleagues proposed that the specificity of a vesicle fusing with its target membrane lies in the interaction of pairs of proteins called v-(vesicle) and t-(target)
a. SNAPs. b. SNAREs. c. NSFs. d. COPs.