Microbiology - The Protozoa

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Study GuideMicrobiologyThe Protozoa1.Classification of ProtozoaProtozoa aresingle-celled, eukaryotic organisms. According to theWhittaker system ofclassification,all protozoa belong to the kingdom Protista.Protozoa are mainly classified based onhow they move. Because of this, different microbiologistsmay refer to these groups as eitherphylaorclasses. Despite the difference in naming, the basis ofclassification remains the same.There arefour major groups of protozoa, each defined by a distinct method of movement.1. MastigophoraFlagellated ProtozoaMembers of this group move using one or moreflagella.Flagella are long, whip-like structuresThey help the organism swim through liquid environmentsCommon examples include:EuglenaChlamydomonasThese organisms are often found in water and may have both plant-like and animal-likecharacteristics.2. SarcodinaAmoeboid ProtozoaProtozoa in this group move by extendingpseudopodia, which are temporary projections ofcytoplasm.Pseudopodia help inmovementThey also help infeeding, by surrounding food particles

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Study GuideExamples include:AmoebaArcellaThese organisms usually live in freshwater, soil, or moist environments.3. CiliophoraCiliated ProtozoaMembers of this group move usingcilia, which are short, hair-like structures covering the surface ofthe cell.Cilia beat in a coordinated mannerThey allow fast and controlled movementExamples include:ParameciumVorticellaCiliates are often more complex than other protozoa and are commonly found in aquatic habitats.4. ApicomplexaNon-motile ProtozoaProtozoa in this groupdo not use flagella, cilia, or pseudopodiafor movement.Most areparasiticThey are adapted to life inside host cellsA well-known example is:Plasmodium, which lives insidered blood cellsand causes malaria

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Study GuideFigure 1An array of protozoa showing representatives of the four major groups.Key Points to RememberProtozoa areunicellular eukaryotesAll protozoa belong tokingdom ProtistaClassification is mainly based onmode of movementThe four major groups are:oMastigophoraoSarcodinaoCiliophoraoApicomplexa
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