Why might the process of chemotaxis in the archaeon Halobacterium be similar to chemotaxis in Bacteria?

Question

Quizplus · Accepted Answer

Both Halobacterium and Bacteria use a similar cascade of proteins in their chemotaxis signaling pathway, which includes receptors, signal transduction proteins, and flagellar motor proteins. These proteins have been well characterized in bacteria, and homologous proteins have been identified in Halobacterium, suggesting a similar process of chemotaxis. The other answer choices may have similarities in some aspects of flagellum assembly or function, but do not directly relate to chemotaxis.

Why Might the Process of Chemotaxis in the Archaeon Halobacterium