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Metabolism - PowerPoint PPT Presentation


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Metabolism. The totality of an organism’s chemical processes, involving thousands of precisely coordinated, complex, efficient and integrated chemical reactions in the cell. It’s all in the cell. Teaching about cell structure and function. Some different approaches Chunking the information

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Presentation Transcript
metabolism
Metabolism
  • The totality of an organism’s chemical processes, involving thousands of precisely coordinated, complex, efficient and integrated chemical reactions in the cell.
teaching about cell structure and function
Teaching about cell structure and function
  • Some different approaches
  • Chunking the information
  • Cells Alive! site
enzymes biological catalysts
Enzymes = “biological catalysts”
  • Catalyst = chem agent that accelerates a reaction without being permanently changed
  • Protein
  • Specific
  • Reusable
activation energy
Activation Energy
  • For reaction to occur, reactants must absorb energy to break bonds
  • Activation Energy is the amount of energy reactant molecules must absorb to start a chemical reaction.
enzymes lower activation energy
Enzymes Lower Activation Energy
  • Stress bonds for catabolism (breakdown)
  • Orient molecules for anabolism (building)
  • Provide microenv. that facilitates the reaction
factors affecting enzyme activity
Factors Affecting Enzyme Activity
  • Temperature—increase temp, increase reaction rate, until heat denatures protein
  • pH – most optimal from 6-8
  • Ionic conc. – most enz cannot tolerate high salinity
  • Many adaptations are exceptions to above
enzyme inhibitors
Enzyme Inhibitors
  • Some chemicals selectively prevent or reduce enzyme activity
  • They resemble an enzyme’s normal substrate and compete for the active site
    • Example: function of DDT & some Ab’s
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