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 and bacteria belong to different domains of life, the eukaryotes and the prokaryotes, sundered by long eons of evolution.Nonetheless, like all forms of life on Earth, they share a common ancestor, and thus there are a number of intriguing similarities.gain, protists and bacteria share these similarities with all other known forms of life. The structure of the ribosome differs somewhat between bacteria and eukaryotes like the protists.