Study Guide Key_Ch_8 - Chapter 8 An Introduction to...

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Chapter 8: An Introduction to Metabolism Key Concepts 8.1 An organism’s metabolism transforms matter and energy, subject to the laws of thermodynamics 8.2 The free-energy change of a reaction tells us whether the reaction occurs spontaneously 8.3 ATP powers cellular work by coupling exergonic reactions to endergonic reactions 8.4 Enzymes speed up metabolic reactions by lowering energy barriers 8.5 Regulation of enzyme activity helps control metabolism Interactive Question 8.1 a. capacity to cause change b. kinetic c. motion d. potential e. position f. conserved g. created nor destroyed h. first i. transformed or transferred j. entropy k. second Interactive Question 8.2 Complete the table to show how the free energy of a system or reaction relates to its stability, tendency for spontaneous change, equilibrium, and capacity to do work. System with high free energy System with low free energy Stability Low high Spontaneous Change will be Change will not be Equilibrium Moves toward Is at Work capacity high Low Interactive Question 8.3 Develop a concept map on free energy and ∆ G . The value in this exercise is for you to wrestle with and organize these concepts for yourself, Do not turn to the suggested concept map until you have worked on your understanding. Remember that the concept map in the answer section is only one way of structuring these ideas – have confidence in you own organization.
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Free energy Measure of determined by Energy available to do work G = H - T S G is H is T is S is free energy change in total absolute change available energy of system temperature in to do work entropy when when measure of G is negative G is positive disorder or usually reaction is randomness decrease in H, reaction is endergonic increase in S spontaneous exergonic Interactive Question 8.4 Label the three components (a through c) of the ATP molecule shown below. a. adenine b. ribose c. 3 phosphate groups d. Indicate which bond is likely to break. By what chemical mechanism is the bond broken? A hydrolysis reaction breaks the terminal phosphate bond and releases a molecule
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Study Guide Key_Ch_8 - Chapter 8 An Introduction to...

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