- They are single-celled organisms that usually live in diverse environments. Bacterial DNA called the nucleoid are a twisted thread-like mass. They even possess a cellular structure that executes a range of circular functions that involves the transfer of energy to the transportation of proteins. Bacteria consist of plasmids which are circular pieces of extra-chromosomal DNA.
- Bacterial cells consist of an inner cell membrane and an outer cell wall. Wherein some of the bacteria do not possess cell wall such as mycoplasmas. In some cases, bacteria may consist of a third protective outer layer in a cell called a capsule.
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