Why a mastectomy may be necessary. A mastectomy is mainly used as a treatment for breast cancer or to reduce the risk of breast cancer developing. Although breast cancer in men is much rarer than female breast cancer, it can also be treated with a mastectomy. Treating breast cancer.
Bacteria. The Bacteria are considered as unicellular prokaryotic organisms. Unlike eukaryotes, bacteria cells lack an organized nucleus, mitochondria, chloroplasts and other membrane bounded organelles. Bacterial cell has only a circular DNA, which does not associate with histone protein.Bacteria do not show sexual reproduction methods.nlike eukaryotes, bacteria cells lack an organized nucleus, mitochondria, chloroplasts and other membrane bounded organelles. Bacterial cell has only a circular DNA, which does not associate with histone protein. Bacteria do not show sexual reproduction methods.
Protists are microscopical, unicellular eukaryotes. They generally live in water. In some cases, protists form colonies of individuals, though the individuals are generally autonomous.bacteria): archebacteria, eubacteria. unicellular org. prokaryotes: simple cellular organization, nucleus lacking membrane. Protista. protozoa brown, red, some green algae phycomycetes, myxomycetes, yeasts. eukaryotes: complex cellular organization, nucleus membrane-bound. Fungi. ascomycetes, basidiomycetes, etc.