Lect18_review

Lect18_review - Announcements Exam 2 is Monday Bring a...

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1 Review Announcements • Exam 2 is Monday • Bring a photo ID, scantron (blue), pencil, (possibly a pen) • Room assignments same as last time: – If your last name begins with • A – Cl go to 212 VEIHMEYER • Co – Gl go to 216 WELLMAN • Go – Z go to 123 SCI LEC • No Discussion next week (Veteran’s Day) Photopigments, e.g., chlorophyl Electron transport chain Proton-motive force Al life shares common energy intermediates, pathways & regulatory mechanisms. Brownian motion (random kinetic energy) al ows molecular interactions. Catalysts are necessary to speed reactions. Light energy can be harvested using pigments. Interactions between 3-D surfaces determine reactions. Enzymes as biological catalysts. Co-enzymes NAD(P), ATP, mineral prosthetic groups Feedback; al osteric enzymes. The Calvin cycle The reverse Krebs cycle Electron donors Carbon fixation Concentrations determine the direction of a reaction. Energy released in a step-wise, control ed way can be recaptured. Energy flows create order. Central Concept: All life is chemistry. Important Related Concepts: Living systems operate far from equilibrium. Energy can be stored in bonds and gradients. Glycolysis Fermentation Krebs cycle Respiration Final electron acceptors Topics that Illustrate concepts : Redox reactions release energy. Laws of thermodynamics BIO-ENERGETICS UNIT : Pigment (e.g., retinal, bacteriochlorophyl , chlorophyl ) Electron Transport chain protein with relatively high electronegativity (strongest oxidizing agent of the ETC proteins) Electron carrier protein with relatively low electronegativity (weakest oxidizing agent of the ETC proteins) Electron Transport chain protein and proton pump with a medium electronegativity (medium oxidizing agent of the ETC proteins) ATPase NADP reductase (adds electrons to NADP + making NADPH) Photon NOTE: Also draw in Protons (H+), NADP+ Æ NADPH, electron donor (ie, H 2 O or H 2 S), and oxidized waste product (ie, O 2 or S°) where appropriate. membrane DRAW: Cyclic Photosynthesis, using any of these components needed (Work with your classmates. You have 3 minutes!) Use your drawing to help you answer the following questions What route do the excited electrons follow in cyclic PS? What work do the excited electrons do in cyclic PS? KEY: What route do the excited electrons follow in cyclic PS? Then back to the pigment they originated from Then on to most electronegative acceptor From pigment to least electronegative acceptor
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2 KEY: What work do the excited electrons do in cyclic PS? H+ H+ H+ H+ H+ Create a proton-motive force by pumping protons out of cell H+ H+ PMF can produce ATP using the enzyme ATPase H+ H+ H+ H+ H+ H+ H+ Cyclic Photosynthesis : Production of ATP using high- energy electrons produced by capturing sun energy Requires: Photon-capturing pigment Light energy (photon) Intact membrane ETC with proton pump ATPase ATP Answer the following: • How is cyclic PS like respiration?
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Lect18_review - Announcements Exam 2 is Monday Bring a...

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