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- According to the chemiosmotic theory, what would be theeffect on oxidative phosphorylation of allowing otherpositive ions to diffuse across the inner mitochondrialmembrane?Under what circumstances could ions flow through anion channel from a region of lower ion concentration toa region of higher ion concentration?What is intercellular co2 (Ci) and is there a correlation iwth photsynthetic rate?
- What is the minimum voltage drop for individual electron transfer events in the mitochondrial electron transport system that is necessary for ATP synthesis?The following plot (percent of O2 bound versus [02]) shows three possible curves (A, B, C). In this case, "B" represents the normal oxygen transport protein. Suppose the local concentration of H+ increases. How might this be represented on the graph? Percent O₂ bound A OA shift from B to C B [0₂] OH+ concentration has no effect (remains curve B) OA shift from B to AWhat would be the effect on ATP production of decreasing the pH inside the mitochondrial matrix? Explain
- Considering the chemicalequation of the aerobiccellular respiration whichmolecules does the cell needand which molecules does itliberate in the process?Although the outer mitochondrial membrane is permeable to all small molecules, the inner mitochondrial membrane is essentially impermeable in the absence of specific transport proteins. Consider this information answer: If the inner mitochondrial membrane were rendered as permeable as the outer membrane, how would that affect oxidative phosphorylation? Which specific processes would stop and which remain?If isolated mitochondria are incubated with asource of electrons such as succinate, but without oxygen,electrons enter the respiratory chain, reducing each of theelectron carriers almost completely. When oxygen is thenintroduced, the carriers become oxidized at different rates(Figure Q14–1). How does this result allow you to order the electron carriers in the respiratory chain? What is theirorder?
- Why is the mitochondrial respiration dependent on ADP?The average time it takes for a molecule to diffuse adistance of x cm is given byt = x2/2D where t is the time in seconds and D is the diffusioncoefficient. Given that the diffusion coefficient ofglucose is 5.7 × 10−7cm2/s, calculate the time it wouldtake for a glucose molecule to diffuse 10 μm, which isroughly the size of a cell.Define what is Na+/K+‑ATPase (NKA)
