Protozoa in Biological Definition

Protozoa

... protozoa (in Greek protos = first and zoon = ... forms may be classified as a kingdom Protozoa. protozoa have traditionally been divided on the basis of ... - but can easily be found under a microscope. protozoa are ubiquitous throughout aqueous environments ...

Eukaryote

... are used to break down peroxide which is toxic otherwise. Many protozoa have contractile vacuoles, which collect and expel excess water, and ... from endosymbiotic prokaryotes, probably proteobacteria . The few protozoa that lack mitochondria have been found to contain mitochondrion-derived ...

Protist

... divided based on similarities to the higher kingdoms. The animal-like protozoa are mostly single-celled, motile, and feed through phagocytosis , though ... cysts , and include several important parasites . Based on locomotion, protozoa are grouped into: Flagellates Move using flagella e.g. ...

Protist

... divided based on similarities to the higher kingdoms. The animal-like protozoa are mostly single-celled, motile, and feed through phagocytosis , though ... cysts , and include several important parasites . Based on locomotion, protozoa are grouped into: Flagellates Move using flagella e.g. ...

Alga

... . All algae lack true leaves , roots , flowers , and other tissue structures found in higher plants. They are distinguished from bacteria and protozoa in that they are photoautotrophic . Thus, the algae are no longer considered a natural grouping, but the term is still used for convenience. The ...

Animal

... then biologists have begun emphasizing evolutionary relationships, and so these groups have been restricted somewhat. For instance, microscopic protozoa were originally considered animals because they move, but are now treated separately. Colloquially humans have been considered to be separate ...

Anaphase

... cells anaphase B follows shortly after anaphase A and extends the spindle to around twice its metaphase length; in contrast yeast and certain protozoa use anaphase B as the main means of chromosome separation and can extend the spindle to up to 15 times its metaphase length in the process. See ...

Autotroph

... other organisms (called heterotrophs ) can utilize as food . Thus, heterotrophs — animals , fungi , as well as most bacteria and protozoa — depend on autotrophs for energy and for the raw materials to make complex organic molecules. The heterotrophs obtain energy by breaking ...

Cell growth

... are important for the growth of some plant tissues. Most unicellular organisms are microscopic in size, but there are some giant bacteria and protozoa that are visible to the naked eye. See: Table of cell sizes - Dense populations of a giant sulfur bacterium in Namibian shelf sediments - ...

Genetic code

... the genetic code Numerous variations of the standard genetic code are found in mitochondria , which are energy-producing organelles . Ciliate protozoa also have some variation in the genetic code: UAG and often UAA code for Glutamine (a variant also found in some green algae ), or UGA codes for ...

Endosymbiont

... many of which are pests or carriers of human disease. For example aphids are crop pests and the tsetse fly carries the organism ( trypanosome protozoa ) that causes African sleeping sickness . Other motivations for their study is to understand symbiosis, and to understand how bacteria with ...

Endosymbiont

... many of which are pests or carriers of human disease. For example aphids are crop pests and the tsetse fly carries the organism ( trypanosome protozoa ) that causes African sleeping sickness . Other motivations for their study is to understand symbiosis, and to understand how bacteria with ...

Genetic code

... the genetic code Numerous variations of the standard genetic code are found in mitochondria , which are energy-producing organelles . Ciliate protozoa also have some variation in the genetic code: UAG and often UAA code for Glutamine (a variant also found in some green algae ), or UGA codes for ...

Marine biology

... chloromonads, prasinomonads, and silicoflagellates. Zooplankton tend to be somewhat larger, and not all in this list are microscopic. Many protozoa are zooplankton, including dinoflagellates (yes, some of these are phytoplankton as well: the plant/animal distinction often breaks down in very ...

Animal

... then biologists have begun emphasizing evolutionary relationships, and so these groups have been restricted somewhat. For instance, microscopic protozoa were originally considered animals because they move, but are now treated separately. Colloquially humans have been considered to be separate ...

Alga

... . All algae lack true leaves , roots , flowers , and other tissue structures found in higher plants. They are distinguished from bacteria and protozoa in that they are photoautotrophic . Thus, the algae are no longer considered a natural grouping, but the term is still used for convenience. The ...

Vacuole

... to pump excess water out of the cell to reduce osmotic pressure and keep the cell from bursting. Contractile vacuoles are found in some freshwater protozoa . Vacuoles in plant cells: the central vacuole Most mature plant cells have a central vacuole , which often takes up more than 80% of the ...