The statement "Natural selection should favor pathogens that strike an optimal balance between the costs and benefits of harming their hosts" describes ________
A) the coincidental evolution hypothesis
B) the shortsighted evolution hypothesis
C) the trade-off hypothesis
D) the energy-balance hypothesis
C
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Ras is like a G protein because it:
A. triggers the formation of cyclic AMP. B. responds to the activation of G protein-coupled receptors. C. is only active when it binds GTP. D. All of these answer options are correct.
The difference between cystic fibrosis and migraine is that the
A) former is caused by various environmental factors. B) former can be traced to a single gene. C) former is caused by the absence of a chromosome. D) latter is a Mendelian trait.
The peacock butterfly experiment demonstrated that ________
a. only spots had any measurable effect on the number of butterflies killed b. sound was more important than spots in butterfly defense against predatory birds c. spots were more important than sound in butterfly defense against predatory birds d. sound had no effect on the number of butterflies killed
Provide a brief summary for the fate of each of the three germ layers. What will be an ideal response?