Bacteria are single cell organism having neither membrane-bounded nucleolus nor membrane-bounded organelles like mitochondria and chloroplasts. You can learn a lot about the life cycles of a bacterium through bacteria diagram.
Bacteria are often considered as cause of diseases caused to human or other animals. But there are certain bacteria like actinomycetes they produce antibiotics such as streptomycin and nocardicin. Other bacteria live symbiotically in the guts of animals and human beings, plant roots which convert nitrogen into the usable form. Bacteria help to breakdown dead organic, it make up the food web in any environment.
Bacteria are of immense importance because of their extreme flexibility, capacity for rapid growth and reproduction.
Bacteria diagram depicts membrane bound organelles such as:
Nucleoid: DNA in Bacterial cell is generally confined to the central region of cell called as Nucleoid. Here it is not bounded by a membrane; it is visibly distinct from the entire cell interior.
Ribosome: Ribosomes are the granular organisms that we found in all living species. Being very small almost some hundred nanometer we need a electro micrograph to view them. The ribosome can also be found in cell cytoplasm of the bacteria.
Enodspore: there are few bacteria like clostridium botulinium generates spores that are highly resisting drought, high temperature and other environmental hazards. Once the hazard is detached these spores germinates to create new population.
Starting from the outermost part when we move towards inward we come across the following structures:
Capsule: capsules are made of the layers of polysaccharides which are proteins. Their function is to protect the bacterial cell and it is often a bacterial cell associated with pathogenic bacteria because it serves as a barrier against phagocytosis by white blood cells.
Outer membrane: This lipid bilayer is created in gram negative bacteria and is the source of lipopolysaccharide commonly known as LPS. LPS is toxic and turns on the immune system of, but not in Gram positive bacteria.
Cell wall: cell wall of peptidoglycan is composed of polysaccharides plus proteins. The function of the cell wall is to maintain the overall shape of a bacterial cell. Bacteria are of three different shapes such as coccus (spherical), bacillus (rodshaped) and spirillium (spiral). Mycoplasma is the bacteria that have no cell wall and therefore they do not have specific shape.
Periplasmic space: the cellular compartment is found in those bacteria only those have outer membrane and plasma membrane. (Gram negative bacteria). In between the space it has enzymes and other proteins that are helpful in digesting and moving nutrients into cells.
Plasma membrane: this is a lipid bilayer which is like the cytoplasmic or cytoplasma of other cells. Numerous proteins are also there within or upon these layers that are primarily accountable for transport of the factors such as ions, nutrients and waste across the membrane.
Along with all these body parts bacteria consists Pili which are hollow, hair like structures made up of protein they permit the transfer from one bacteria cell to another, they are also known as fimbriae.
Flagella: Flagella brings motility, they are long appendages which revolves by means of the motor located under cytoplasmic membrane.