Before DNA Sequencing Became Practical, Taxonomists Based Prokaryote Classification on Observable

Before DNA sequencing became practical, taxonomists based prokaryote classification on observable phenotypic characters.Choose the character least likely to distinguish the spirochetes from other groups of prokaryotes.

A) Shape
B) Content of the cell wall
C) Pattern of movement
D) Presence of motor proteins linking internal flagella to the cell wall
E) Presence of an axial filament