Which model would predict that populations diverge from one another through the slow accumulation of adaptive
changes within each population?
a. punctuated equilibrium
b. paedomorphosis
c. hybridization
d. allopolyploidy
e. gradualism
e
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Review the experiments by Kohler and Lipton described in Fig. 9.5. What is the key difference between blood serum and blood plasma that affects their ability to help fibroblasts grow in culture?
A. Serum contains more platelet cells than plasma, and platelet cells promote cell growth. B. Molecules found in serum promote cell growth; these molecules are not found in plasma. C. Plasma contains more platelet cells than serum, and platelet cells inhibit cell growth. D. Molecules found in plasma inhibit cell growth; these molecules are not found in serum.
If you were designing an artificial device to mimic a nerve involved in perceiving pressure, what kind of potential would the device need to mimic?
A. threshold potential B. action potential C. graded potential D. both threshold and action potentials E. both threshold and graded potentials
How do fossils provide evidence of evolution? How are scientists able to determine the age of fossils? What will be an ideal response?
Over a period of many generations, a single species of snake has changed to the point that organisms from two different areas are no longer able to interbreed. This is an example of
A. divergent evolution. B. polyploidy. C. adaptive radiation. D. convergent evolution.