The North American bison was hunted to near extinction in the 1800s, and has since recovered, but with decreased genetic diversity. This is an example of
A. gene flow.
B. increased mutation rate.
C. a bottleneck effect.
D. natural selection.
E. a founder effect.
C. a bottleneck effect.
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Once bound to a hormone, this receptor becomes active and catalyzes the transfer of a phosphate group to itself or intracellular proteins.
A. G-protein coupled receptor B. enzyme-linked receptor C. ligand-gated ion channel receptor D. mechanoreceptor E. thermoreceptor
Companion cells are connected via plasmodesmata to
a. trichomes. b. tracheids. c. sieve tube members. d. guard cells. e. vessel members.
Many animal trainers give rewards to an animal when it performs a behavior correctly. This type of learning is called
a. insight learning b. operant conditioning c. imprinting d. innate learning e. habituation
Which of the following neurons are part of the peripheral nervous system?
A) sensory neuron and motor neuron B) interneuron neuron and motor neuron C) interneuron neuron and sensory neuron D) only motor neurons