Study Guide 4 Answers

Study Guide 4 Answers - over the reactants . Cells never...

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Answers to study guide 4 Proteins/Metabolism (Kopachik) Questions: Some reactions are endergonic whereas others are _ exergonic . In comparing the two with regard to reactants and product chemical bonds and stability we find that the products are more stable in the _ exergonic reaction and have less chemical energy so the energy lost could be made to do work. The reactions in which delta G is negative are spontaneous and exergonic but the reactions in which it is not are _ endergonic . Delta G is determined by the formula _ ΔG = ΔH – T ΔS and is the difference in free energy between the starting and ending states. The chemical energy of the products must be decreased or entropy increased or both must occur if the reaction is to go spontaneously. The chemical equilibrium is another important factor and in the cell must be _ greater than one in order for the reaction to proceed. It is the ratio of the _ products
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Unformatted text preview: over the reactants . Cells never want the _ K eq to be zero because then the forward and backward reactions are going at the same pace. In order for _ endergonic reactions , those requiring energy, to go they must be _ coupled with an exergonic reaction. The _ hydrolysis of the energy currency molecule _ ATP is often employed; it has a delta G of _-7.3 kcal/mol . This exergonic reaction can be coupled to _ exergonic (anabolic) reactions not exceeding this value.This molecule has three highly negatively charged _ phosphate groups trying to repel each other so when broken the enthalpy is greatly _ decreased . The formation of glutamine from glutamic acid and _ ammonia is an example of an endergonic reaction which is coupled. Other proteins such as transporters can be _ phosphorylated and then _ dephosphorylated with the energy of ATP hydrolysis making the transport of the ion proceed....
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