35 - Wednesday, November 17, 2010 Lecture 35 Announcements:...

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Wednesday, November 17, 2010 Lecture 35 Announcements: **Now that quiz 9 has occurred: IF YOU HAVE TAKEN ALL 9 QUIZZES, YOU CANNOT TURN IN QUIZ 10 FOR GRADING! NO STUDENT CAN TAKE MORE THAN 9 QUIZZES** 1. The make-up final exam will take place on Wed 12/15 from 9:00 – 11:30AM. Room to be announced. You MUST e-mail the prof to describe your conflict. You must tell the prof about your conflict BEFORE 11/24/10. ( Do NOT ask for a special time for your final exam, unless you were ill and you missed both the regular exam and the make-up exam). 2. No class on Wednesday 11/24. There will be a quiz on Wednesday 12/1 (no PyMOL on that quiz). 3. No office hours or reviews next week, 11/22 - 11/26 4. The last "Friday discussion" of the semester: medical school interview experiences of three former biochemistry students, 11/19 at 2:55PM in Comstock B108. 5. CU Pre-Dental Society presents a talk by an Ithaca orthodontist, Dr. Stephen O. Hand, on Thursday 11/18 at 5:00PM in Rockefeller 105. 6. Recent high-quality video of events in the mitochondrion: http://www.youtube.com/watch?v=RrS2uROUjK4 Lecture from Monday: The synthesis of ATP is driven by the favorable flow of H + through ATP Synthase, F o F 1 , which is a molecular motor that turns, causes the binding sites (active sites) for ADP + P i to change, synthesizing and releasing ATP. . key events after a photon is absorbed: heat, fluorescence, energy transfer, and photochemistry Today’s Lecture: p. 245 We start with energy that is absorbed from the antenna, and transfers to PSII. 1. Energy transfer: a special pair of chlorophyll a molecules, in the photosynthetic reaction center, that have maximum light absorption at 680 nm, accept the energy from the antenna via energy transfer . This pigment is called P680. After the energy has been absorbed, this molecule becomes quite different chemically! This molecule, excited with significant energy beyond its ground state, is now called P680*. P680* has a relatively strong tendency to transfer electrons (it has a negative standard reduction potential of ~ –0.9V, therefore is a FAR better reducing agent than any molecules or ions shown on LG p. 176 in the table of Standard Reduction Potentials).
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35 - Wednesday, November 17, 2010 Lecture 35 Announcements:...

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