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Bio124S_07Present9

Bio124S_07Present9 - Cells Structures and Functions of the...

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Cells Structures and Functions of the Basic Units of Life
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Cells Cells divide organisms into compartments. A cell can be an independent functioning unit. In higher organisms, cells become so specialized that they must rely on each other for the full range of functions. Cells themselves can be further divided into compartments.
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Cell Theory - What Theory? Cells are the fundamental units of life. All organisms are composed of cells. All cells come from preexisting cells.
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Cells Are Small - Microscopic A cell's size determines its surface area- to-volume ratio. Increasing volume decreases the surface area-to-volume ratio. The surface of a cell enables cellular exchange and communication with the cell’s environment.
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Increase in Volume Decreases Area/ Volume Ratio
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Some Sizes of Biological Items
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Some Sizes of Biological Items
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Parts of Cells Every cell is surrounded by a plasma membrane made up of a lipid bilayer with proteins floating within it and protruding (sticking out) from it. It is a “selectively permeable” barrier , enabling cells to maintain a constant internal environment. It exchanges information with adjacent cells and receives extracellular signals such as hormones. It exhibits molecules that are responsible for adhering to adjacent cells.
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Prokaryotes and Eukaryotes (What about Archeae?) Prokaryotes have no nucleus or other membrane-enclosed compartments. They lack distinct organelles.
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