Bio48F11HO04

Bio48F11HO04 - Biology 48 - Human Physiology Lecture 4...

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Biology 48 - Human Physiology Lecture 4 Molecular Movement & Enzyme Function Molecular Movement : Brownian Movement : Degree of motion depends on: 2 nd Law of Thermodynamics : Universe naturally becomes: : Entropy : All naturally occurring motions function to: Categories of Movement : 1. Diffusion : Movement of from an : : Movement from a: : Stops when: Equilibrium: System is completely: : Diffusion uses NO : 2 Types of Diffusion – Passive Transport : a. Passive Diffusion : : Diffusion directly : ie : Movement of O 2 2 b. Facilitated Diffusion : : Membrane channels allow : IMPORTANT: Facilitated and passive diffusion classified as : Requires no ongoing : 2. Active Transport : Protein Assisted transport 1
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• Requires Energy Expenditure a. Primary Active Transport : : Cellular Pumps • Uses : b. Secondary Active Transport : : “ Coupled Transport ” or “ Cotransport • Simultaneous movement of : Utilizing energy in : 3. Osmosis : Diffusion of : • Primarily : : Protein Assisted • Movement from : • Movement from : Chemical Energy Dynamics : 1. EXGERGONIC Reactions : Reactants : Greater degree of : Breaking bonds results in: ie : Glucose 2 Pyruvic Acids + Energy 2. ENDERGONIC Reactions : Products : Greater degree of Construction of bonds: Activation Energy : • Energy required for a reaction to : : Only small numbers of reactants posses enough : 2
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Small portion of reactants: Question : How can cells increase product formation? or Answers: 1. Increase : Not Feasible : Unable to regulate: 2. Enzymes : Specialized Proteins * (RNA) Catalysts : Molecules which: a. Increase: b. Are not: c. Do not change : • Function: Lower
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Bio48F11HO04 - Biology 48 - Human Physiology Lecture 4...

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