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.
Kingdom Archaea â¢âarchaeâ bacteria= âancientâ bacteria â¢Contains most of the âextremophilesâ â¢Prokaryotes-no membrane bound organelles â¢Encompasses 5 phyla, and includes the methanogens and extreme halophiles and thermophiles.â¢Until 1977 archaea were classified as bacteria. The majority of archaea are extremophiles. â¢ Acidophile An organism with optimal growth at pH levels of 3 or below â¢ Alkaliphile An organism with optimal growth pH levels of 9 or aboveâ¢ Anaerobe An organism that does not require oxygen for growth.