Flagella are found in both eukaryotic cells and prokaryotic cells.Despite the functional similarities of all flagella,scientists suspect that eukaryotic and prokaryotic flagella have evolved independently.Why don't they think there is a common evolutionary origin for prokaryotic and eukaryotic flagella?
A)Eukaryotic flagella undergo an undulating motion and are covered by a plasma membrane;prokaryotic flagella move by rotating and lack a plasma membrane.
B)Prokaryotic flagella do not protrude outside the cell wall,whereas eukaryotic flagella are membrane-bound extensions of cytoplasm.
C)Prokaryotic flagella are an adaptation to scarce nutrient supplies,whereas eukaryotic flagella are designed to protect.
D)Prokaryotic flagella do not require energy in the form of ATP as eukaryotic flagella do.

Question

Quizplus · Accepted Answer

The differences in structure and function described in option A suggest that the two types of flagella have evolved independently, rather than from a common ancestor. The other options do not provide evidence for or against a common evolutionary origin of flagella.

Flagella Are Found in Both Eukaryotic Cells and Prokaryotic Cells