Biology: A Guide to the Natural World with mybiology" (4th Edition)

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KroghS10.018Energy Jan 21, 2011 Energy and Life Topic 5 - Chapters 6 and 7 I. The Nature of Energy A. What is Energy? B. Energy changes form C. Laws of Thermodynamics II. Energy in Living Things A. What is energy used for? Cellular metabolism includes: 1. Synthesis of molecules 2. Transportation of materials 3. Mechanical work: movement B. ATP: The "energy currency" of the cell 1. Adenosine Tri-Phosphate (ATP) is a nucleotide 2. Endergonic reactions required to provide energy to form phosphate bonds 3. Breaking the phosphate bonds provides energy for life (exergonic) 4. ATP works by energizing protein enzymes and other molecules C. Enzymes are catalysts that speed chemical reactions 1. Enzyme molecules bind substrate molecules in their active sirtes 2. Enzymes lower the activation energy of a particular chemical reaction making difficult, improbable reactions much easier to carry out
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IV. OVERVIEW: RELEASING ENERGY FROM FOOD A. Most Food Macromolecules Easily Metabolized to Form Glucose B. Cellular Respiration : Metabolism of Glucose that Releases Energy to Form ATP
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Topic5-Energy - KroghS10.018Energy Energy and Life Topic 5...

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