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22-11-2017, 04:52 PM

what are disadvantages of amoeba?? please share your knowledge

jaseela123d · 23-11-2017, 10:44 AM

An amoeba often called amoeboid is a type of cell or organism that has the ability to alter its shape, mainly by extending and retracting pseudopods. Amoebas do not form a single taxonomic group; instead, they are found in all the major lineages of eukaryotic organisms. Ameboid cells occur not only among protozoa, but also in fungi, algae and animals. Microbiologists often use the terms "amoeboid" and "amoeba" interchangeably for any organism that exhibits amoeboid movement.

In older classification systems, most amoebae were placed in the class or subphylum Sarcodina, a grouping of unicellular organisms that possess pseudopods or move by protoplasmic flow. However, molecular phylogenetic studies have shown that Sarcodina is not a monophyletic group whose members share common descent. As a result, amoeboid organisms are no longer classified together in a group.

The best-known amoeboid protists are the "giant amoebas" Chaos carolinense and Amoeba proteus, both widely cultivated and studied in classrooms and laboratories. Other well-known species include the so-called "brain-consuming amoeba" Naegleria fowleri, the intestinal parasite Entamoeba histolytica, which causes amoebic dysentery, and the multicellular "social amoeba" or slime mold Dictyostelium discoideum.

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