Membrane+Osmosis+Diffusion+Edit - Chapter 3 Lecture Outline...

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1 Cell Membranes, Transport & Communication Chapter 3 Lecture Outline
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2 Plasma Membrane: Gate and Gatekeeper All cells have a plasma membrane Separates the cell from its environment Serves as a selectively permeable barrier Biologically important molecules transported across the membrane
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3.5  Molecules embedded within the  plasma membrane help it perform its  functions.
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There are four primary types of membrane  proteins, each of which performs a different  function.
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© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e 6
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7 Passive and Active Transport – Crossing the cell membrane. Passive transport : down hill in energy Movement from high concentration to low Active transport requires added energy Movement from low concentration to high Energy derived from ATP Produces a concentration gradient
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© 2006 W.W. Norton & Company, Inc. DISCOVER BIOLOGY 3/e 8
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9 Passive Transport (Cell does not expend energy) Molecular movement caused by Brownian Motion .
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