1. Organization:
* Bacteria are made up of cells, the basic unit of life.
* They have a distinct internal structure with components like DNA, ribosomes, and a cell membrane.
2. Metabolism:
* They carry out chemical reactions to obtain energy and build essential components.
* They break down food sources (like sugars) to produce energy (ATP) through processes like respiration and fermentation.
3. Growth:
* Bacteria increase in size and reproduce through binary fission, a process where a single cell divides into two identical daughter cells.
4. Reproduction:
* Bacteria reproduce asexually, primarily through binary fission. Some species also engage in horizontal gene transfer, which allows for the exchange of genetic material between individuals.
5. Response to stimuli:
* Bacteria respond to changes in their environment, such as temperature, nutrient availability, and the presence of toxins.
* For example, some bacteria move towards food sources or away from harmful chemicals.
6. Adaptation:
* Over time, bacteria can evolve and develop resistance to antibiotics or other environmental stresses.
* This is due to genetic mutations and natural selection, where individuals with beneficial traits are more likely to survive and reproduce.
7. Homeostasis:
* Bacteria maintain a stable internal environment, even when their external environment changes.
* They regulate their internal temperature, pH, and water content.
While bacteria are simple in structure compared to complex multicellular organisms, they possess all the key characteristics of life. They are self-sustaining, actively interact with their environment, and can evolve over generations.
