A eukaryotic cell (Fig. 4-6) is larger and more complex than a prokaryotic cell and found in animals, plants, algae, fungi, and protozoa. When you look at a eukaryotic cell with a microscope you'll notice a highly organized structure of organelles that are bound by a membrane. Each organelle performs a specialized function for the cell's metabolism. Eukaryotic cells also contain a membrane-bound nucleus where the cell's DNA is organized into chromosomes.
Depending on the organism, a eukaryotic cell may contain external projections called flagella and cilia. These projections are used for moving substances along the cell's surface or for moving the entire cell. Flagella move the cell in a wavelike motion within its environment. Cilia move substances along the cell's
surface and also aid in movement of the cell. Flagella and cilia are comprised of axoneme microtubules. An axoneme microtubule is a long, hollow tube made of protein called a tubulin.
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