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.
In a 3-dimensional system, it contains Archaea, bacteria and eukaryotes. Protists. Protists are all eukaryotes and therefore all have cell organelles, most of them are single-celled but multi-celled form exists. Protists contain three groups: algae, slime molds (fungi) and protozoa.Algae include three groups: red algae, brown algae and green algae.rotists are all eukaryotes and therefore all have cell organelles, most of them are single-celled but multi-celled form exists. Protists contain three groups: algae, slime molds (fungi) and protozoa. Protozoa can reproduce via sexual and asexual pathway.