The nitrogen-fixing site of cyanobacteria is a cell slightly larger/translucent than the vegetative cell, round, located in the middle or top of the filament. Lack of photosynthetic system II (PSII) does not produce CO2 or fix CO2, creating an anaerobic environment to prevent nitrogenase from being damaged by O and maintain its activity.

Gram-negative bacteria, also known as mycoplasmas, are the smallest single-cell microorganisms that have no cell wall and can live independently outside the body.

Does not contain cell wall, cell morphology is changeable

The cell membrane contains sterols and is tougher than the membranes of other prokaryotes

Most reproduce by binary fission

Gram-negative bacteria are a type of prokaryotes that are obligately parasitic in cells

Reproduces by binary fission, cannot live independently, and is sensitive to commonly used antibiotics

It is a type of G-prokaryotic microorganism that is obligately parasitic in eukaryotic cells.

It has a cellular structure; the cell contains both RNA and DNA nucleic acids; it has a cell wall (but lacks peptidoglycan) G-; it has ribosomes; it lacks the enzyme system to generate energy and must be strictly intracellular parasitism; it reproduces by binary fission; Sensitive to antibiotics and drugs that inhibit bacteria; can only be cultured with living organisms such as chicken embryo yolk sac membrane, mouse mold cavity or HeLa cell tissue culture

There are two forms: the original body and the original body.

The life cycle includes two stages: vegetative cells and dormant bodies (fruiting bodies)