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	reaction (Site not responding. Last check: 2007-10-18)
		Endergonic reaction - An endergonic reaction is a chemical reaction where the variation of free energy is positive.
		Chain reaction - A chain reaction is a reaction in which one of the agents necessary to the reaction is itself produced by the reac...
		Exothermic reaction - In chemistry, an exothermic reaction is one that releases heat.
	www.serebella.com /search/topic-reaction.html (566 words)

	rate of exergonic reactions
		Exergonic reactions are those in which the free energy of the final state is less than the free energy of the initial state.
		Endergonic reactions are those in which the free energy of the initial state is less than the free energy of the final state.
		In an endergonic reaction the free energy of the initial state is lower than the free energy of the final state.
	academic.brooklyn.cuny.edu /biology/bio4fv/page/exergon.htm (278 words)

	Endergonic -- An endergonic reaction is at first sight an exception to the S... (Site not responding. Last check: 2007-10-18)
		Endergonic -- An endergonic reaction is at first sight an exception to the S...
		An endergonic reaction is at first sight an exception to the Second Law of Thermodynamics.
		Endergonic reactions result in decreased randomness and stability, and increased order in a part of the observed system.
	endergonic.en.tracking24.net (97 words)

	Campbell Biology Place Chapter 6 -- Activities Quiz
		It is acquired by a reactant in an endergonic reaction.
		It is acquired by a reactant in a spontaneous reaction.
		It is acquired by a reactant in an exergonic reaction.
	www.hbwbiology.net /quizzes/ch6-metabolism.htm (423 words)

	energy metabolism in cells
		Endergonic reactions may be described either by the change in G value [[[Delta]]G] or by the equilibrium constant.
		Endergonic reactions tend to reach equilibrium when the concentration of reactants is still high and the concentration of products is low.
		Endergonic reactions may also be 'pulled' forward by removing the products of the reaction as fast as they form, so that the reaction is prevented from reaching its equilibrium point.
	campus.northpark.edu /biology/cell/energymetab.html (1201 words)

	Chapter 6 (ATP)
		Metabolic reactions are organized into pathways that are orderly series of enzymatically controlled reactions.
		Since many metabolic reactions are reversible, they have the potential to reach equilibrium.
		Exergonic hydrolysis of ATP is coupled with endergonic processes by transferring a phosphate group to another molecule.
	www.niles-hs.k12.il.us /jacnau/Chpt6atp.html (1718 words)

	Assignment #7: Energy
		Redox(reduction) reactions may involve only a solitary electron, as when sodium loses an electron and becomes oxidized to Na, and chlorine gains an electron and is reduced to Cl Often, however, the electron travels with a proton, that is, as a hydrogen atom.
		An endergonic reaction that is driven by the splitting of ATP molecules is therefore called a coupled reaction.
		The chemical reactions occurring in a nerve cell are very different from those occurring in a red blood cell because the two kinds of cells have a different array of enzymes.
	www.angelfire.com /ut/biocheat/assign7.html (2635 words)

	04-energyenzymes (Site not responding. Last check: 2007-10-18)
		In this way, the reactions are "coupled." The usual partner for coupling exergonic reactions is ADP (capturing energy as ATP); the usual partner for coupling endergonic reations is ATP (reforming ADP).
		Yes, endergonic reactions have activation energy--by definition, there is a larger activation energy to overcome for a reaction proceeding in the endergonic direction than in the exergonic direction.
		Heat speeds up a reaction by raising the energy level of the reactants (the molecules are moving faster), and results in a higher rate of collisions and collisions with more force, both of which increase the number of collisions that result in transferring enough energy to overcome the activation energy barrier.
	www.ups.edu /faculty/kirkpatrick/bio111/studyquestions/00answers/04aenergyenzymes.htm (1402 words)

	Cell Biology
		An example is phosphorylation of glucose, the first step in glycolysis, where the phosphorylation reaction is endergonic, but is coupled to the exergonic hydrolysis of ATP.
		Reaction 1: The standard free energies of hydrolysis for phosphocreatine and ATP are shown below.
		Hence, pumping Ca out is endergonic, because it's going against its electrochemical gradient (the inside of the cell is also negatively charged with respect to the outside).
	www.lclark.edu /~reiness/cellbio/keys/key12000.htm (2207 words)

	Answers to Text Questions
		The endergonic reactions in the pathway require a total of 17.3 kcal/mole of energy to drive the reactions of the pathway.
		The endergonic reactions in the pathway require 17.3 kcal/mole and so the overall change in free energy of the pathway would be:
		When chemical bonds are broken during these chemical reactions, the energy released is emitted as light energy and the organism glows.
	highered.mcgraw-hill.com /sites/0072437316/student_view0/chapter8/answers_to_text_questions.html (737 words)

	EXERGONIC REACTIONS. Free term papers for college, book reports and research papers. Welcome to Essay Express
		Explain what is meant by "coupled reactions" and describe how exergonic reactions can be used to push or pull endergonic reactions in order to get them to proceed.
		Endergonic reactions require energy input-the energy of the products is higher than that of the reactants.
		The glycolytic pathway is an arrangement of these kinds of coupled reactions, where exergonic steps push or pull endergonic steps, with the favorable net free energy change of the steps taken together, allowing the series of reactions to go on.
	www.essayexpress.com /essay/006300.html (413 words)

	Endergonic reaction - Wikipedia, the free encyclopedia
		An endergonic reaction is a chemical reaction in which the change in free energy is positive.
		An endergonic reaction is a reaction in which ΔG > 0 in Gibbs free energy, in contrast to an exothermic reaction, which uses ΔH as in enthalpy.
		This page was last modified 03:42, 17 October 2005.
	en.wikipedia.org /wiki/Endergonic_reaction (69 words)

	Energy
		A reaction that consumes free energy is endergonic and the sign of ÆG is positive and is non-spontaneous.
		Free energy coupling involves combining an exergonic reaction with an endergonic reaction so that the overall reaction is exergonic.
		Almost all reactions occurring in the cell occur via the activity of enzymes.
	carroll1.cc.edu /~jclausz/botany/Energy.html (889 words)

	An Introduction to Metabolism (Site not responding. Last check: 2007-10-18)
		Indeed, one can think of the energy required to drive forward the endergonic dehydration synthesis reaction as energy that becomes trapped in chemical bonds and associated with electrons that are now farther from atomic nuclei than they otherwise might be (in fact, were).
		For a chemical reaction to happen at all, it must either be spontaneous or energy must be supplied to drive the reaction forward.
		Note that this reaction requires energy (i.e., it is endergonic) which is true in general for dehydration synthesis (i.e., dehydration synthesis is an example of an anabolic reaction)
	www.mansfield.ohio-state.edu /~sabedon/campbl06.htm (2204 words)

	Endergonic reaction - Encyclopedia, History and Biography
		0 in Gibbs free energy, in contrast to an exothermic reaction, which uses ΔH as in enthalpy.
		This article or section should be merged with Exergonic.
		This page was last modified 16:12, 26 Apr 2005.
	www.arikah.net /encyclopedia/Endergonic_reaction (150 words)

	Chapter 5 (Site not responding. Last check: 2007-10-18)
		Often, reactions are coupled, so the energy released from an exergonic reaction is used to drive an endergonic one.
		Energy given off from food catabolism is used to drive endergonic reactions such as synthesis of complex molecules.
		Sometimes, coupled reactions occur in different places, so energy from the exergonic reaction must be transferred to the location of the endergonic reaction.
	www.cofc.edu /~owensm/bio101c5.html (750 words)

	Energy, Enzymes, and Catalysis Problem Set (Site not responding. Last check: 2007-10-18)
		The equilibrium constant for an exergonic reaction is greater than 1, meaning that the concentration of products is greater than the concentration of reactants at equilibrium.
		Oxidation-reduction (Redox) reactions are examples of the coupling of exergonic and endergonic reactions.
		Enzymes often act by coupling an endergonic reaction to the exergonic hydrolysis of ATP.
	www.biology.arizona.edu /biochemistry/problem_sets/energy_enzymes_catalysis/08t.html (114 words)

	quizenergy
		When an enzyme catalyzes both an exergonic reaction and an endergonic reaction, the two reactions are said to be
		reactions involving certain substrates are catalyzed by certain enzymes.
		reactions with certain activation energies are catalyzed by certain enzymes.
	users.sisna.com /tbeagley2/QENERGY.HTM (230 words)

	Encyclopedia: Endergonic reaction
		In chemistry, an exothermic reaction is one that releases heat.
		Enthalpy (symbolized H, also called heat content) is the sum of the internal energy of matter and the product of its volume multiplied by the pressure.
		Categories: Chemical reaction stubs Endergonic means to absorb energy.
	www.nationmaster.com /encyclopedia/Endergonic-reaction (217 words)

	Dummy’s Guide to Whether a Chemical Reaction will Occur in a Cell (Site not responding. Last check: 2007-10-18)
		The reason that many chemical reactions go overwhelmingly in one direction is that they go in the direction that releases energy.
		Gasoline and oxygen combine with such a big release of energy that once the reaction starts it continues until you run out of either gasoline or oxygen.
		About 40% of the energy released in the top line reaction is captured in the bottom line reaction.
	www.ccsn.nevada.edu /science/jreed/DG-CR.htm (1121 words)

	[No title]
		These reactions require ENERGYEnergy is the capacity to do work Potential vs. Kinetic Energy Laws of Thermodynamics: 1st law = the law of conservation= energy cannot be created or destroyed but only change from one form to another.
		If energy is released during spontaneous reaction, the reaction is EXERGONIC If energy input is required for reaction to occur, the reaction is ENDERGONIC Endergonic reactions are COUPLED with Exergonic reactions. (follows the first law of thermodynamics) Adenosine triphophate (ATP) is the cell’s primary energy storage molecule 1.
		Exergonic rx.: ATP — P = ADP + energy An exergonic reaction releases energy which is used by ADP to produce ATP Cellular Respiration: C 6 H 12 O 6 + 6O 2 -------------- 6CO 2 + 6H 2 O + ATP 1.
	www.nv.cc.va.us /home/kbrilakis/respiration.doc (476 words)

	Biology 350 Course Outline (Site not responding. Last check: 2007-10-18)
		Having determined that the reaction requires an input of free energy, the next question is "which exergonic reaction might be serving as the source of free energy to drive the endergonic reaction".
		Redox reactions have a reference standard that is a hydrogen electrode and under standard conditions we provide the oxidant and reductant at 1.0 M concentration.
		If this exergonic reaction energy could be coupled to an endergonic reaction such as the transport of sucrose then the active transport of sucrose could be achieved.
	www.botany.ubc.ca /biol350/topic2.html (2876 words)

	Cellular Metabolism
		We also distinguish between the free energy available to make chemical reactions occur (see Section B) and "entropic" energy (heat), which is a consequence of the degeneracy of the system.
		As indicated by the last equation, however, not all of the energy released by an exergonic reaction is free to be used by an endergonic one.
		All reactions must proceed spontaneously, either because they are exergonic or because they are coupled with a sufficiently exergonic reaction to provide the extra energy necessary to drive an otherwise non-spontaneous endergonic reaction.
	www.rwc.uc.edu /koehler/biophys/8e.html (1403 words)

	[No title] (Site not responding. Last check: 2007-10-18)
		lowers the energy barrier for a chemical reaction.
		Then it uses the energy released by the hydrolysis of ATP, an ____ reaction, to do various kinds of work in the cell.
		endergonic 3 5.4 Energy of activation is released when a large molecule breaks up.
	www.msci.memphis.edu /~wiemerhp/trg/corpora/biology/Ch05cast.txt (942 words)

	Lecture 3 (Site not responding. Last check: 2007-10-18)
		Although there are a large number of endergonic reactions which are "driven" by the hydrolysis of ATP, there are also other sources of free energy.
		In addition many reactions that are endergonic derive their source of free energy from the energy stored in a solute gradient.
		Now in the combined reaction it is clear that to combine the two reactions into a single reaction requires that the new enzyme have both hydrolytic power (to remove the terminal phosphate of ATP) and phosphorylation power (to transfer the phosphate to glucose).
	www.botany.ubc.ca /biol350/topic3.html (1173 words)

	REACTIONS & ENZYMES
		Reactions that require energy to initiate the reaction are known as endergonic reactions.
		In oxidation/reduction reactions, one chemical is oxidized, and its electrons are passed (like a hot potato) to another (reduced, then) chemical.
		Reactions that show a net loss in energy are said to be exergonic; reactions that show a net gain in energy are said to be
	www.emc.maricopa.edu /faculty/farabee/BIOBK/BioBookEnzym.html (1582 words)

	atoms, molecules and life (Site not responding. Last check: 2007-10-18)
		An example of an exergonic reaction is cellular respiration in which sugar glucose is broken down into water and carbon dioxide releasing energy.
		This energy is called activation energy.In a cell the Endergonic reactions obtain their energy from exergonic reactions.
		Typically the endergonic reaction is physical seperated from the exergonic reaction.
	sun.menloschool.org /~dspence/biology/chapter4/chapt4_1.html (257 words)

	General Biology 2, quasi-full multimedia presentation on ENERGY, ENZYMES, AND METABOLISM
		Can visualize reaction as proceeding from an initial state where there is a high free energy in reactants towards a final state where there is a low free energy, with a mix of products and reactants.
		Thus, a non-spontaneous reaction can be made to occur in a living system by providing energy from another reaction that is coupled to it.
		Metabolism = chemical reactions in organism that are catalyzed by enzymes.
	www.usd.edu /biol/genbio/153/karen/enzymes2.html (2070 words)

	Energy, Enzymes, and Catalysis Problem Set (Site not responding. Last check: 2007-10-18)
		An energy diagram for an endergonic or non-spontaneous reaction is shown to the right.
		Energy must be added for this reaction to proceed.
		The equilibruim constant for an endergonic reaction is less than 1.
	www.biology.arizona.edu /biochemistry/problem_sets/energy_enzymes_catalysis/16t.html (71 words)

	LECTURE NOTES CHAPTER 6 (Site not responding. Last check: 2007-10-18)
		Metabolic reactions are organized into pathways that are a series of enzymatically controlled reactions.
		Endergonic reaction = An energy-requiring reaction that proceeds with a net gain of free energy; a reaction that absorbs free energy from its surroundings (Fig 6.6b).
		Reaction occurs and energy is released as new bonds form (downhill portion of the curve).
	www.framingham.edu /faculty/biology1/Snyder_lecture_notes_chapter_6.htm (2427 words)

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