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.
Viruses are prokaryotes and not Eukaryotes. Therefore they are not alive. Since it is not considered to be alive they do not belong in the 5 kingdom classification; Monera, Fu â¦ ngi, Plantae, Animalia, Protista. Bacteria are living once celled organisms and belong to either bacteria or Archaea.ince it is not considered to be alive they do not belong in the 5 kingdom classification; Monera, Fu â¦ ngi, Plantae, Animalia, Protista. Bacteria are living once celled organisms and belong to either bacteria or Archaea.