In each fly species, the entire body segment that gave rise to the original flight wings is missing. The mutation(s) that led to the flightless condition probably affected the ________ genes, making the initial mutants examples of ________.
A) thorax; complete metamorphosis
B) exoskeleton; exaptations
C) Hox; complete metamorphosis
D) thorax; exaptations
E) Hox; adaptive radiants
Answer: C) Hox; complete metamorphosis
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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.
In nerve cells, the _______ use ATP
a. potassium channels b. sodium channels c. sodium-potassium pumps d. potassium and sodium channels e. sodium channels and the sodium-potassium pump
The second messenger for the hormone mechanism in the accompanying figure is:
a. ATP. b. G protein. c. cAMP. d. calmodulin. e. Ca2+.
The passage of an arthropod through stages from egg to adult is called
A. metamorphosis. B. succession. C. graduation. D. evolution. E. differentiation.