The nature of Archaea cell walls varies considerably among different species and some have wall that only have proteinaceous material in them. Mycoplasmas and Archaea are not inhibited by penicillin. Functions include attachment, conjugation, receptor site for phage. Flagellae - confer motility, may be polar or peritrichous. Composed of flagellin, forming helical subunits, growth at tip.
Bacterial flagellum consists of a single filament.
Function similar to electric motor shaft. Energy derived from proton motive force. Many flagellated bacteria exhibit chemotaxis in response to a stimulus gradient. Although unbound by a nuclear envelope, the chromosome is contained within nucleoid region. Composed of ribosomal RNA, and protein.