# LEC 2 - MCB 102 Professor Buchanan Lecture 16 ASUC Lecture...

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MCB 102 Professor Buchanan 2/27/09 Lecture 16 ASUC Lecture Notes Online is the only authorized note-taking service at UC Berkeley. Do not share, copy or illegally distribute (electronically or otherwise) these notes. Our student-run program depends on your individual subscription for its continued existence. These notes are copyrighted by the University of California and are for your personal use only. D O N O T C O P Y Sharing or copying these notes is illegal and could end note taking for this course. ANNOUNCEMENTS I’ve had students ask me where the lectures are online. I think the lectures will be posted online, but I do not post them before the lecture. I wait until the lecture is over before I post them online. The reader is pretty complete, so I suggest you get a copy. LECTURE Last time, we almost completed Chapter 16, the bioenergetics section. We went through an introduction to metabolism, the laws of thermodynamics, and relating that to reaction equilibria. We talked about ATP, as well as redox reactions and potentials. If Gibbs free energy change is negative, the reaction is spontaneous and will proceed forward. If it is positive, the reaction is nonspontaneous and will proceed backwards. Electrons often flow to oxygen because it represents the lowest energy state. Table 13-7 lists standard reduction potentials of some biologically important half-reactions. We start with the hydrogen electrode at -0.414, and we move up all the way the chart to the reduction of oxygen to form water. Another important equation is the relation between electron potential to Δ G. E = Eo + RT/nF * ln [electron acceptor]/[electron donor], but a more familiar equation would be to relate it to Gibbs free energy, or Δ Go = -nF Δ Eo. From the last lecture, you should be familiar with all of the following: autotrophs and heterotrophs, how to calculate Δ Go given Keq, how ATP drives thermodynamically unfavorable reactions, ways electrons are transferred, ways ATP is hydrolyzed, how to calculate electron potential, Δ Go from Δ Eo. A few problems are 2, 4, 11, and 20. For problem

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LEC 2 - MCB 102 Professor Buchanan Lecture 16 ASUC Lecture...

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