section4

section4 - MIT Department of Biology 7.014 Introductory...

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MIT Department of Biology 7.014 Introductory Biology, Spring 2005 Recitation Section 4 Answer Key February 14-15, 2005 Biochemistry—Energy and Glycolysis A. Why do we care In lecture we discussed the three properties of a living organism: metabolism, regulated growth, and replication. Today we will focus on metabolism and biosynthesis. 1. It was said in lecture that chemical reactions are the basis of life. Why do we say that? 2. Why is metabolism required for life? 3. Can an entity that performs no chemical reactions be considered “alive?” 4. Most reactions necessary for life are unfavorable, or do not proceed at an appreciable rate under physiological conditions. How do cells overcome this problem? B. Thermodynamics 1. What is “free energy”? 2. Where is this energy stored?
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We say that G is a thermodynamic property, meaning that it is independent of the way that the conversion of reactants to products might proceed. 3. Based on how energy is stored in the molecules, explain why G is independent of the path of the reaction. 4. If G=0, the reaction is at equilibrium. What then is the meaning of the magnitude of G? 5.
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section4 - MIT Department of Biology 7.014 Introductory...

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