Chapter 8- INCOMPLETE.docx

Chapter 8- INCOMPLETE.docx - Chapter 8 An Introduction to...

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Chapter 8: An Introduction to Metabolism Metabolic Pathways - All of the chemical processes in a cell are called metabolism; you can think of this as an elaborate road map of thousands of chemical reactions arranged in intersecting metabolic pathways. These pathways start with a specific molecule, which is then altered in a series of defined steps (each catalyzed by an enzyme), resulting in a certain product. (Can be 1+ starting molecules or products) - Like traffic lights, mechanisms regulate enzymes based on metabolic supply and demand. o Catabolic pathways- Release energy by breaking down complex molecules to simpler compounds (ex. Cellular respiration breaking down glucose to CO2 and H2O) o Anabolic pathways- Consume energy to build complicated molecules from simpler ones (ex. Synthesis of amino acids/proteins) - Catabolic/anabolic pathways are like going downhill or uphill. Energy from catabolic pathways can be stored to drive the reactions of anabolic pathways. Thermodynamics - First law of thermodynamics- Energy can be transferred/transformed, but not created nor destroyed. - Second law of thermodynamics- Every energy transfer/transformation makes the universe more
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  • Spring '14
  • Gustin,Michael

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