ZOO 2700 Study Guide - Chagas Disease, Bioluminescence, Microvillus
8 Dec 2013
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The pluricellular algae are eukaryotes of simple structure too. All these elements are found dispersed throughout the cytoplasm. Protozoans do not have cell walls: protozoans from the mastigophora group (like trichomonas) have flagella and others, others from the ciliated group (like paramecium) have cilia, all protozoans, as eukaryotes, have nucleus. The cytoskeleton provides the cell with structure and shape, and by excluding macromolecules from some of the cytosol it adds to the level of macromolecular crowding in this compartment. [3] cytoskeletal elements interact extensively and intimately with cellular membranes. Microfilaments (actin filaments: these are the thinnest filaments of the cytoskeleton. They are composed of linear polymers of actin subunits, and generate force by elongation at one end of the filament coupled with shrinkage at the other, causing net movement of the intervening strand. They also act as tracks for the movement of myosin molecules that attach to the microfilament and walk along them.
