Eukaryotic Cells

Eukaryotic Cells - because larger cells have a smaller...

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Eukaryotic Cells Cells contain structures called organelles . The structure and function of the major organelles found in eukaryotic cells are described below. Plasma membrane All cells are surrounded by a plasma membrane. It separates the contents of the cell from its environment and regulates the passage of molecules into and out of the cell. The membrane contains proteins that have a variety of functions. For example, some proteins are receptors which can detect the presence of certain kinds of molecules in the surrounding fluids. The function of membrane proteins will be discussed in more detail in the chapter on membranes. An actively metabolizing cell needs a large surface area. Cells are limited in size
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Unformatted text preview: because larger cells have a smaller surface to volume ratio. Cells that are specialized for absorption (ex: intestinal cells) have folds in the plasma membrane called microvilli that increase the surface area. Pseudopodia are temporary extensions of the plasma membrane used for movement or to engulf particles. Pseudopodia can be seen in the Amoeba below. Cell Wall The cell wall functions to support and protect the cell. Plants have cell walls composed of cellulose ; fungi have walls composed of chitin . The cell walls of these onion skin cells can be easily seen. The diagram below shows a chloroplast that has been cut lengthwise to reveal the interior....
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This note was uploaded on 01/04/2012 for the course BSC BSC1005 taught by Professor Orlando,rebecca during the Fall '10 term at Broward College.

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Eukaryotic Cells - because larger cells have a smaller...

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