230-SQs_II_revised

230-SQs_II_revised - 7 Bio 230 Study Questions from Lecture...

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7 Bio 230 Study Questions from Lecture Part II: SQs for Exam II 24. Enz 1 Enz 2 Enz 3 Enz 4 A-------> B---------> C--------> D---------->E a) Explain what feedback inhibition means by referring to the metabolic pathway shown. b) If the mechanism of feedback inhibition is allosteric regulation, how does it work (what does the effector do, and what is the result)? 25. Enz 1 Enz 2 Enz 3 Enz 4 A-------> B---------> C--------> D---------->E Enz 5 Enz 6 Enz 7 --------> L -----------> M---------> N If feedback inhibition occurs in the above metabolic pathway, list the two most likely enzymes affected, and the molecules most likely to control them. 26. Answer the questions below with reference to the following diagram, which represents energy levels relative to molecules X and Y. a) Which energy difference (a-f) represents the free energy change for the reaction X-->Y? b) Which energy difference represents the activation energy for the uncatalyzed reaction? c) Which energy difference represents the activation energy for the catalyzed reaction? 27. a) Why does a molecule such as ATP remain ATP, and not spontaneously break down to ADP and phosphate, even though such a reaction would release energy? (What does it take to get it to react?) b) How do enzymes increase rates of chemical reactions, from immeasurably slow to extremely fast?
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SQs 8 28. a) Why do enzyme-catalyzed reactions have saturation kinetics, where the rate of the process reaches a maximum and levels off with increasing substrate concentration? b) Saturation kinetics and the lower activation energy (compared to uncatalyzed reactions) of enzyme-catalyzed reactions have the same molecular basis. What is it? 29. a) What is the general meaning (not just as it applies to enzymes) of the phrase "optimum conditions"? b) Why do most enzymes exhibit a narrow range of optimum conditions such as pH, temperature, and salt concentration? 30. a) Describe the organization of phospholipids in a cell membrane. b) Describe the specific bonds, including molecules or parts of molecules involved, that hold a phospholipid bilayer together. c) Explain why the following statement is true or false: a membrane is a polymer of
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230-SQs_II_revised - 7 Bio 230 Study Questions from Lecture...

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