Protozoa Report

Topics: Eukaryote, Protist, Asexual reproduction Pages: 2 (800 words) Published: February 4, 2012
Protozoa are single-celled eukaryotes organisms whose cells have nuclei that normally show characteristics associated with animals, most common mobility and heterotrophy. They are often grouped in the kingdom Protista together with the plant-like algae and fungus-like water molds and slime molds. Most algae are classified in the kingdoms Plantae and Chromista, and some the remaining forms may be classified as a kingdom Protozoa. The name is misleading, since they are not animals. Protozoa have traditionally been divided on the basis of locomotion. Most protozoans are too small to be seen with the naked eye - most are around 0.01-0.05 mm, although forms up to 0.5 mm are still fairly common - but can easily be found under a microscope. There are 4 groupings of protozoans. The Amoeba called the Sarcodines and the Flagellates called the Mastigotes are sometimes linked into one group called the Sarcomastigotes because of similar features. The Ciliates are about as complicated as single cells can be. The Sporozoans tend to be tiny parasites, often living inside other cells, but are also pretty complicated. Most people recognize the Amoeba as blobby, with a shape that's always changing, kind of oozing along a surface. Most of your white blood cells, which aren't amebas at all, also look and act like this. Our human genes include codes to that build good look-a-like Amoebas. Amoeba have a feature that sets them apart from most other protozoans, a type of extension of the cell, called pseudopods "phony feet". The classic amoeba has fairly thick pseudopods, produced by moving material inside the cell in such a way that part of it is pushed out. The membrane of a pseudopod is able to stick to most surfaces, and the rest of the cell sort of "flows" into position. The flagellates are characterized by the possession of flagella: one or more but rarely more than a dozen long, mobile extensions from the cell. Unlike pseudopods, flagella have a rigidly-organized core...
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