The rash of spotted fever rickettsiosis is the result of
A. damage to endothelial cells.
B. infection of skin cells.
C. allergic reaction to the vector.
D. production of a toxin that causes inflammation.
E. infection of sebaceous glands.
Answer: A
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Male frogs give calls that attract female frogs to approach and mate. Researchers examined mating calls of closely related but separate species of tree frogs in South America. What outcomes could possibly occur where the ranges of two species overlap?
I) The species will interbreed, eventually fusing over time. II) A stable hybrid zone will form if hybrids are better adapted to the area of overlap than either parent species is. III) Species will continue to diverge and be isolated by behavioral or genetic mechanisms. A) I B) II C) III D) I, II, and III
Examine the figure above. In the continental U.S., the dark green patches show areas with the highest bird species richness. What best explains why these areas have such diversity?
A. These areas have the highest temperatures in the continental U.S.
B. These areas have mountainous terrain.
C. These areas have well-protected natural areas.
D. These areas have low frequencies of extreme weather events and fire.
If van der Waals forces are weak, how can geckos utilize these forces to cling to and walk up vertical smooth
surfaces?
What will be an ideal response?Which of the following is true of carbon fixation?
1.It takes place in the thylakoid membrane. 2.The carbon that is incorporated into glucose in this reaction comes from CO2. 3.Carbon fixation occurs only once in C4 plants but twice in C3 plants. 4.C4 plants use the enzyme rubisco, while C3 plants don’t use rubisco.