Chapter 4 Notes

Jul 8th, 2016
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Lecture Notes generated from the following book: Biology, the Dynamic Science. Russell, Wolfe, Hertz and Starr. 2008. ISBN 978-0-534-24966-3

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Showing Page: 1/54
Energy, Enzymes, andBiological ReactionsChapter 44.1 Energy, Life, and the Laws ofThermodynamics Energy exists in different forms and states The laws of thermodynamics describe energyflow in natural systemsEnergy: thecapacity to do work Potential Energy Capacity to makethings happen Chemical energy Potential energy ofmolecules Kinetic energy Energy of motion HeatVideo MotionEnergy may be converted between potential and kinetic statesMetabolism Cells capacity to acquire energy and use it tobuild, store, break apart, and eliminatesubstances in controlled methods Anabolism -Metabolic reactions that requireenergy to assemble simple substances into morecomplex substances. Catabolism -Metabolic reactions that breakdown complex molecules to make their energyavailable to do work.VideoMetabolismReaction type?Catabolic reactions Breakdown complex molecules Release potential energy for cellular workReaction type?Anabolic reactions Use energy to convert simple substances intomore complex formsThermodynamicsStudy of transforming energy Study of energy flow between a system and itssurroundings during chemical and physicalreactions First Law of Thermodynamics Total amount of energy in the universe is constant Energy cannot be created or destroyed Can only change formFirst Law ofThermodynamics Total amount ofenergy in asystem and itssurroundingsremain

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