Several Dozen Different Proteins Comprise the Prokaryotic Flagellum and Its

Multiple Choice

Several dozen different proteins comprise the prokaryotic flagellum and its attachment to the prokaryotic cell, producing a highly complex structure. Certain proteins of the complex motor that drives bacterial flagella are modified versions of proteins that had previously belonged to plasma membrane pumps. This evidence best supports which of the following claims?

A) Natural selection produces organs that will be needed in future environments.
B) The motors of bacterial flagella must have originated in other organisms.
C) Natural selection can favor new structures that have been coupled together from parts of other structures.
D) Bacteria that possess flagella must have lost the ability to pump certain chemicals across their plasma membranes.