Chapter 5 Part II

Chapter 5 Part II - Chapter 5 Part 2: Membrane Transport...

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Chapter 5 Part 2: Membrane Transport 5.2 The Plasma Membrane Composed of . o head : Phosphate group o two tails : Fatty acids lipid forms spontaneously in water o interior of bilayer is . : barrier to molecules o also found in the interior : makes membrane more rigid membrane also has . o transmembrane (span entire membrane) o surface proteins (only on one side) o Figure 5.6 Proteins are embedded within the lipid bilayer Movement Across Membranes To survive cells must o move water and nutrients into cell o eliminate waster . movement occurs across membrane in one of three ways o Diffusion o Membrane Folding o Protein Transport 5.10 Diffusion and Osmosis Molecules move randomly o tendency to produce uniform mixtures Diffusion = molecules move from high => low concentration o diffuse down concentration gradient : ends when equilibrium is reached o Figure 5.26 How diffusion works Not all substances can diffuse across plasma membrane o Must be small
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This note was uploaded on 04/07/2008 for the course BI 200 taught by Professor Price during the Spring '08 term at CSU Long Beach.

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Chapter 5 Part II - Chapter 5 Part 2: Membrane Transport...

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