Amoeba is a genus of single-celled amoeboids in the family Amoebidae. The type species of the genus is Amoeba proteus, a common freshwater organism, widely studied in classrooms and laboratories.
A genus of motile, unicellular eukaryotic amoeboid protists within the family Amoebidae that are commonly found in fresh water environments. Members of the Amoeba genus are not generally considered to be human pathogens.
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In a broader sense, Amoeba is a genus that falls under the Phylum Amoebozoa. Phylum Amoebozoa is a major and broad taxonomic group containing about more than 2,400 described species of amoeboid protists discovered so far. Whereas, Genus Amoeba contains not more than 20 species discovered so far.
- Habitat and Uses
- Reaction to Stimuli
- Amoebas Pathogenic to Humans
Amoeba itself is found in decaying vegetation in fresh and salt water, wet soil, and animals.Due to the ease with which they may be obtained and kept alive, they are common objects of study as representative protozoa and to demonstrate cell structure and function.
The cell's organelles and cytoplasm are enclosed by a cell membrane, obtaining its food through phagocytosis. Amoebae have a single large tubular pseudopod at the anterior end, and several secondary ones branching to the sides. The most famous species, Amoeba proteus, is 700-800 μm in length but the species Amoeba dubia is as large as a millimeter, and visible to the naked eye. Its most recognizable features include a single nucleus and a simple contractile vacuole to maintain osmotic pressure. Food enveloped by the amoeba is stored and digested in vacuoles. Amoebae reproduce through binary fission. In cases where the amoeba are forcibly divided, the portion that retains the nucleus will survive and form a new cell and cytoplasm, while the other portion dies.
Hypertonic and hypotonic solutions
Like most cells, amoebae are adversely affected by excessive osmotic pressure caused by extremely saline or dilute water. Amoebae will prevent the influx of salt in saline water, resulting in a net loss of water as the cell becomes isotonic with the environment, causing the cell to shrink. Placed into fresh water, amoebae will also attempt to match the concentration of the surrounding water, causing the cell to swell and sometimes burst.Adjusting the tonicity of the cytoplasm can also damage...
1. Main article: Microbial cyst In environments which are potentially lethal to the cell, some amoeba may become dormant by forming itself into a ball and secreting a protective membrane to become a cyst; the cell remains in this state until it encounters more favourable conditions.While in cyst form the amoeba will not replicate and may die if unable to emerge for a lengthy period of time.
Marine amoeba lack contractile vacuoles and their enzymesand organelles are not damaged by the salt water found in seas, oceans, salt swamps, salty rivers and ponds.
Amoebozoan species, such as those in the genus Amoeba, typically have bulbous (lobose) pseudopods, rounded at the ends and roughly tubular in cross-section. Cercozoan amoeboids, such as Euglypha and Gromia, have slender, thread-like (filose) pseudopods.
Amoeba, also spelled as Ameba, is a genus that belongs to protozoa, which are unicellular eukaryotes (organisms with membrane-bound cell organelles). The name Amoeba is derived from the Greek word amoibe, which means change. There are many species, of which the most extensively studied is Amoeba proteus.
Amoeba. the order of the simplest organized protozoa of the class Sarcodina. Most live in fresh waters, a few in the soil; there are parasitic forms. They are usually of microscopic dimensions up to 50 μm, but there are also “giants” such as Pelomyxa, which grows to 2–3 mm. Amoebas have no constant body shape; their cytoplasmic body ...
Feb 05, 2013 · Although most amoebas live alone (like this one), social amoebas gather together to improve their chances to survive. Social amoebas are single-celled organisms that can work together in a unique way. Instead of playing together on a sports team, these organisms gather together to form a single, multi-celled organism.
- Zygomycota considered the most important species in the genus Rhizopus - common in tropical and subtropical regions - Kingdom: Fungi - Order: Mucorales - Family: Mucoraceae - Genus: Rhizopus - grow on ammonium salts or amino compounds - up to 2.5 mm long and about 20 μm in diameter - UV can delay spore germination