Amoebae, slime mold, algae and protactists are some examples of unicellular organisms. Unicellular organisms fall under the main groups of bacteria, archaea, protozoa, single-celled algae and single-celled fungi. The two general categories are prokaryotes, which lack membrane-bound nuclei and membrane-bound organelles, such as mitochondria; and eukaryotes, which are more complex, having membrane-bound organelles and nuclei.Know More
Unicellular organisms are ubiquitous to most environments on Earth. Unicellular organisms have been found in the most extreme environments, such as arid deserts, frozen tundra, highly acidic subterranean environments and hydrothermal vents on the ocean floor; these organisms are called extremophiles. Extremophiles are described by the environments in which they grow optimally, such as acidophilic for acidic environments and thermophilic for environments with high temperatures.
Unicellular organisms can be innocuous to humans, but they are also responsible for diseases. Malaria is caused by a unicellular parasite of genus plasmodium. It is prevalent in tropical and sub-tropical environments. As of 2010, there were an estimated 219 million cases of malaria resulting in 660,000 deaths worldwide. The disease is transmitted from person to person by the bite of the Anopheles mosquito. Prevention includes the use of mosquito nets, pesticides and disruption of mosquito breeding grounds. There are several forms of treatment for malaria as well as ongoing development of a vaccine.Learn more about Biology
Even a single drop of pond water may contain thousands of organisms, including different types of bacteria, protozoa, algae, rotifers, hydras and worms. Although most of the organisms that live in water are microscopic, a few are large enough to see with the naked eye.Full Answer >
Like algae and plants, Euglena cells contain chloroplasts that allow them to create food through photosynthesis, but they can also take in nutrients from other organisms when light is not available. Euglena are a unique group of single-cell organisms that have some of the same functions as both plants and animals.Full Answer >
Common examples of multicellular protists include brown algae, green algae, red algae and slime molds. Algae are classified as plant-like protists, while slime molds are categorized as fungus-like protists.Full Answer >
Examples of monerans include bacteria and blue-green algae. Bacteria are the most populous of all living organisms and critical to life on this planet. As decomposers, they break down organic matter and return the nutrients to the soil for plants to absorb.Full Answer >