The Prokaryotic Flagellum Is a Complex Structure Consisting of Several

question 41

Multiple Choice

The prokaryotic flagellum is a complex structure consisting of several dozen different proteins. Which of the following statements best describes the origin of flagella in prokaryotes?

• A) Natural selection cannot account for the evolution of the prokaryotic flagellum.
• B) Ancestral versions of this protein assemblage were either less functional or had different functions than modern prokaryotic flagella.
• C) Flagella could not have arisen by evolution because the structure is too complex to have evolved gradually.
• D) The need for more complex structure must have driven evolution.

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