Once species have formed, they keep their identity by
A. developmental differences.
B. structural modifications.
C. isolating mechanisms.
D. genetic blocks.
E. somatic mutations.
Answer: C
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Refer to the figure above. Why is it important to preserve the red panda?
A) The group has very few representatives of its lineage. B) The group is particularly sensitive to environmental disturbances. C) The group has low genetic diversity. D) The group is economically important. E) All of the lineages in the figure above are important to preserve.
Nerves would be best described as:
A) collections of motor neuron dendrites and cell bodies. B) bundles of axons in the peripheral nervous system (PNS). C) bundles of dendrites in the peripheral nervous system (PNS). D) collections of sensory neuron dendrites and cell bodies.
Stabilizing selection occurs when
a. the environment controls which organisms will survive. b. humans determine which organisms will survive.
c. the extremes of the population have a lesser chance to survive. d. the extremes of the population have a better chance to survive. e. the organisms on one extreme of the population have a better chance to survive than those on the other extreme.
The MPF protein complex turns itself off by _____
A) activating a process that destroys cyclin components B) activating an enzyme that stimulates cyclin C) binding to chromatin D) exiting the cell E) activating the anaphase-promoting complex