Problem set 5ans

Problem set 5ans - Problem Set 5 Bio 1A Spring 2008 1...

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Problem Set 5 Bio 1A Spring 2008 1. Describe the now widely accepted model that explains how the mitochondrial electron transport chain makes ATP. What is the role of the ATP synthase in this model? Chemiosmotic model. Electron transport results in pumping of H+ ions out of matrix into intermembrane space. Transport of H+ down an electrochemical gradient through the ATP synthase into the matrix provides the energy to synthesize ATP from ADP and Pi. 2. What are the reactants and products (used and produced) during electron transport? NADH and FADH2, O2 yield H2O 3. What is the function of O 2 in oxidative phosphorylation? It’s the final electron acceptor or oxidizing agent. 4. What are redox reactions in the electron transport chain used to do? How is the generation of a concentration gradient important for the production of ATP? Redox reactions involves the loss (oxidation) or gain (reduction) of control over electrons. The H+ concentration gradient provides what is know as the proton motive force used to generate ATP. 5. What does it mean to say that cellular respiration is ~38% efficient? It means that respiration can capture up to 38% of the total Δ G hydrolysis of glucose in the form of high energy intermediates such as ATP. The rest is lost as heat. 6. What are the three stages of cellular respiration? Where within a eukaryotic cell does each stage occur?
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