The difference between simple diffusion and facilitated diffusion is that facilitated diffusion
A) moves materials from a higher to a lower concentration.
B) moves materials from a lower to a higher concentration.
C) requires ATP.
D) requires transporter proteins.
E) does not require ATP.
D
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Hunters waiting to kill "prize bucks" over smaller white-tailed deer can possibly change allele frequencies of the deer population. If smaller deer are speared this could lead to
A. no adverse effects on the white-tailed deer species. B. a founder effect, from hunting, will allow small groups of larger white-tailed deer to establish habitats away from human populations. C. directional selection for smaller white-tailed deer will result in fewer "prize bucks." D. natural selection of deer with large antlers. E. a bottleneck effect, from hunting, that will cause extinction of the white-tailed deer.
The net outcome of predator-prey interactions in the basic Lotka-Volterra models is that
A) the predator drives its prey to extinction and then goes extinct itself. B) the prey population declines and this causes the predator population to also decline. C) predator and prey populations eventually converge on equilibrium population sizes that are maintained into infinity. D) predator and prey populations oscillate, with each predictably increasing and decreasing in response to the other.
The complementary three-base sequences on tRNA are called_________
Fill in the blank(s) with the appropriate word(s).
Selection that acts over evolutionary time to preserve traits that increase an individual's ability to mate is known as __________.
a. directional selection b. disruptive selection c. sexual selection d. stabilizing selection e. balancing selection