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The diversity of protoctist cell shape, arrangement and size
- Words:
- 668
- Submitted:
- Mon Jun 19 2006
Have a little read: ... The diversity of protoctist cell shape, arrangement and size. Protoctista are broadly defined as all the unicellular eukaryotes and any multicellular descendants that are neither plants, animals nor fungi (Ridge 2001). The kingdom includes nearly 30 Phyla with thousands of species living in different environments, and adapting in different ways to survive. The most commonly known and simple protoctist is the Amoeba genus. Amoeba proteus (fig 1) is a single celled amoeba that lacks flagella. It has no cytoskeleton or external test and feeds by phagocytosis. Several pseudopods are formed enabling the organism to move. It has a single nucleus and may be up to 450 ?m in size. A much smaller group of organisms are the phylum Cryptophyta (fig 2). These unicellular, flat organisms are only 3-5?m in size and are discussed again later. Protoctista may have no flagella (like Amoeba proteus), one flagella, or be multiflagellates. The Cryptophyta (fig 2) have two
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