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Biology 120: Chapter 6(Energy, Feedback inhibition, enzymes)

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by: Jamisha Evans

Biology 120: Chapter 6(Energy, Feedback inhibition, enzymes) BIO 120

Marketplace > Western Kentucky University > Biology > BIO 120 > Biology 120 Chapter 6 Energy Feedback inhibition enzymes
Jamisha Evans
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About this Document

These notes cover the notes from the previous lecture (3/17)
Sahi, Shivendra
Class Notes
Biology 120: Energy, Feedback inhibition, Enzymes




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This 2 page Class Notes was uploaded by Jamisha Evans on Monday March 21, 2016. The Class Notes belongs to BIO 120 at Western Kentucky University taught by Sahi, Shivendra in Winter 2016. Since its upload, it has received 64 views. For similar materials see BIOL CONC CELLS METAB GENETICS in Biology at Western Kentucky University.


Reviews for Biology 120: Chapter 6(Energy, Feedback inhibition, enzymes)

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Date Created: 03/21/16
Biology 120 Notes Chapter 6 Chapter 6 Energy 7: Metabolism  Energy • Energy: capacity to do work ◊ 2 states of energy… ♦ Kinetic: energy of motion ♦ Potential: stored energy • Energy is stored as potential energy in chemical bonds ◊ Many forms of energy ♦ Mechanical, heat sound, electriccurrent, light, or radioactivity ◊ Heat is the most convenient way of measuring energy ♦ 1 calorie= heat required to raise 1 gram of water 1˚C ◊ Energy begins with the sun and the flows into the biological world ♦ Photosynthetic organisms capture this energy • Thermodynamics : branch of chemistry concerned with energy changes ◊ Laws of thermodynamics ♦ First law: energy can only be change form but cannot be created or destroyed. The total amount of energy in the universe remains constant ♦ Second law: energy transformations are spontaneously to convert matter from a more ordered/less stable form to a less ordered/ more stable from. Entropy is constantly increasing. • Free energy ◊ G=H-TS ♦ G: energy available to do work ♦ H: enthalpy, energy in a molecules chemical bonds ♦ T: absolute temperature ♦ S:entropy, unavailable energy • Change In free energy ◊ G= H-TS ♦ G: change In free energy ♦ G is Positive… • When products have more free energy than reactants • When H is higher or S is lower • When the reaction is endergonic ♦ G is negative when… • When products have less free energy than reactants • When His lower or S is higher or bot • When the reaction is spontaneous • When the reaction is exergonic • Metabolism ◊ Metabolism: the sum of all chemical reactions carried out by an organism. ♦ Anabolic reactions/anabolism • Use energy to build up molecules (synthesis) ♦ Catabolic reactions/catabolism • Gather energy by breaking down molecules • Biochemical pathways ◊ Reactions occur in a sequence ◊ The product of one reaction is the substrate for the next ◊ Many steps take place in organelles • Feedback inhibition ◊ The end-product of pathway binds to an allosteric site on enzyme that catalyzes the first reaction in pathway. ♦ Raw materials and energy are not wasted ◊ Changes enzyme so that the initial enzyme cannot bind to it which as a result the whole pathway shuts down.


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