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.
Bacteria are prokaryotic while protists are eukaryotic. Bacteria  DNA is not contained within a nucleus, and it is circular, whereas  in eukaryotes the DNA is found in compa â¦ ct chromosomes. Prokaryotes  (like bacteria) also lack organelles such as mitochondria,  endoplasmic reticulum, etc.aking the world better, one answer at a time. All three, viruses, protists, and bacteria, reproduce asexually. However, bacteria replicates through binary fission, while viruses reproduce through replication. Protists are also capable of reproducing sexually.