The picture shows a schematic illustration of a bacterium. Not always and not all bacteria possess the depicted structural elements.
In all bacteria: Cytoplasm membrane, cytoplasm, nucleoid, ribosomes
In phototrophic bacteria (exception: chlorobia): Thylakoid
In Chlorobia: Chlorosomes
Cell wall: Gram-positive bacteria - thick wall; gram-negative bacteria - thin wall (as well as another biomembrane outside of the cell wall)
Flagella: Occurence, number, positioning, and lenght vary among bacteria types; always coil-shaped
Pili: Occurence, number, positioning, and lenght vary among bacteria types
Glycocalyx: Occurence, thickness, and composition of mucins vary among bacteria types and exterior conditions
Plasmids: Occurence and number vary among bacteria types.
Gas vesicles: Occurence, size, and number vary among bacteria type and exterior conditions
Source: Brudersohn
