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Chapter 8 energy and enzymes

Chapter 8 energy and enzymes - 5 Co-factors 6...

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Chapter 8: An introduction to metabolism I. Metabolism A. Definition B. Coupling of anabolic and catabolic pathways usually occurs in functional cells C. Enzymes regulate metabolic pathways II. Energy A. Forms of energy are inter-convertible (Fig. 8.2) 1. Forms of energy: kinetic and potential 2. Organisms transform energy from potential to kinetic B. Energy transformations increase the entropy of the universe C. Organisms depend on free energy 1. Free energy 2. Spontaneous reactions (Fig. 8.6a; Fig. 8.8) 3. Non-spontaneous reactions 4. Coupling or exergonic and endergonic rxns occur in the cell (Fig. 8.10) III. Enzymes A. Definition B. How do enzymes catalyze reactions? (Fig. 8.14, 8.15) C. Enzyme structure relates to its function (Fig. 8.16, 8.17) 1. Structure 2. Function D. How do enzymes lover the Activation Energy? E. Factors affecting enzyme activity (velocity) 1. Initial substrate concentration 2. Speed of enzyme 3. Efficiency of enzyme 4. Environmental factors (Fig. 8.18)
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Unformatted text preview: 5. Co-factors 6. Inhibitors (Fig. 8.19) a. competitive inhibitors b. non-competitive inhibitors (Fig. 8.20) 7. Activators and cooperation IV. Metabolic pathways (Fig. 8.21) V. Some things you should know after studying this chapter A. Terms: anabolic, catabolic, potential and kinetic energy, free energy, exergonic and endergonic reactions, enzymes, Activation Energy, active site, competitive and non-competitive inhibitors, allosteric regulation, feedback inhibition. B. Explain why the hydrolysis of ATP is an exergonic reaction (diagrams may help). C. How do enzymes catalyze reactions? What do they do? D. By what mechanisms to enzymes lower the activation energy of reactions? E. How do temperature and pH influence enzyme activity (be able to make drawings)? F. Compare competitive and non-competitive enzyme inhibitors (similarities and differences). G. Why is feedback inhibition important in biological systems?...
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