#Question id: 4993
#Unit 11. Evolution and Behavior
If the prokaryotic flagellum developed from assemblages of proteins that originally were not involved with cell motility but with some other function instead, then the modern prokaryotic flagellum is a(n)
#Question id: 4994
#Unit 11. Evolution and Behavior
In certain motile prokaryotes, dozens of different proteins comprise the motor that powers the prokaryotic flagellum. The motor has a complicated structure, and its various proteins interact to carry out its function. Based on Darwinʹs explanation for the existence of human eyes, how would he probably have explained the existence of such motors?
#Question id: 4995
#Unit 11. Evolution and Behavior
It has been found that certain proteins of the complex motor that drives bacterial flagella are modified versions of proteins that had previously belonged to plasma membrane pumps. This is evidence in support of the claim that
#Question id: 4996
#Unit 11. Evolution and Behavior
An explanation for the evolution of insect wings suggests that wings began as lateral extensions of the body that were used as heat dissipaters for thermoregulation. When they had become sufficiently large, these extensions became useful for gliding through the air, and selection later refined them as flight-producing wings. If this hypothesis is correct, insect wings could best be described as
#Question id: 4997
#Unit 11. Evolution and Behavior
If one organ is an exaptation of another organ, then what must be true of these two organs?
#Question id: 4998
#Unit 11. Evolution and Behavior
Many species of snakes lay eggs, but in the forests of northern Minnesota where growing seasons are short, only live-bearing snake species are present. This trend toward species that perform live birth is an example of