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Unformatted text preview: Handout for CHAPTER 6 - Energy Flow in a Cell Remember how important energy is for life! • Every organism requires a constant supply of external energy to remain alive.-Inability to obtain or use energy= DEATH What is energy? • Definition= The capacity to do work. • Energy comes in many forms: some examples-Heat-Light-Moving particles-Chemical bonds of molecules! (Our focus)! First law of thermodynamics – the conservation of energy • First law of thermodynamics (from physics) • Energy can change from one form to another, but it cannot be created or destroyed. What is the primary source of energy for all life on our planet? • Where does the energy needed to sustain life on Earth come from? -SUN- 2 types of Energy Potential • (stored energy)-Can’t be used by cells directly-Chemical bonds contain potential energy 1 • Chemical bond are the most important to us • Kinetic energy • ( Energy of motion)-Useful energy cells use to do work, etc.- Breaking chemical bonds releases kinetic energy. Relationship between potential and kinetic energy • Energy Conversion-Potential energy is converted to kinetic energy which can then do work. What kind of energy do molecules have?...
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This note was uploaded on 03/27/2011 for the course BIO 1420 taught by Professor Rast during the Spring '08 term at Texas State.
- Spring '08