finalexams06 - CH 369 Final Exam 1. A reaction such as A B...

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CH 369 Final Exam 1. A reaction such as A B with a positive enthalpy value indicates a. energy input is required for the reaction to proceed in the forward direction. b. energy is released from the reaction proceeding in the forward direction. c. a state of high order. d. a state of disorder. e. a non-spontaneous reaction. 2. A reaction with a low, negative enthalpy value and a high, positive entropy value is a. at equilibrium b. spontaneous c. nonspontaneous d. It is impossible to determine without knowing numeric values. e. None of these are true. 3. Water molecules are capable of forming how many hydrogen bonds? a. one b. two c. three d. four e. five 4. Which of the following types of bonds or interactions is the strongest? a. ionic interactions b. hydrogen bonds c. covalent bonds d. Van der Waals interactions e. electrostatic interactions 5. What is the primary, chemical reason oil and water separate after being mixed? a. Water causes the oil molecules to have additional attractive forces among themselves. b. Oil is denser than water. c. Hydrogen bonds between the water molecules are not strong enough to disrupt the London dispersion forces that attract oil molecules to each other. d. It is entropically unfavorable for water molecules to hydrate each oil molecule. e. None of these cause the separation.
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6. Calculate the pK a of a solution at pH 11 if the concentration of the acid and its conjugate base is 0.01M and 0.001M respectively. The Henderson Hasselbach equation is a. 12 b. 10 c. 7.4 d. 10.1 e. 11.1 7. Which amino acid can participate in disulfide bridges? a. methionine b. cysteine c. serine d. tyrosine e. aspartate 8. Channels that allow ions to move from high to low concentrations are called a. active transporters b. passive transporters c. antiports d. symports e. none of the above 9. Which of the following statements is true of enzyme catalysts? a. They bind to substrates but are never covalently attached to substrate or product. b. They increase the equilibrium constant for a reaction, thus favoring product formation. c. They increase the stability of the product of a desired reaction by allowing ionizations, resonance, and isomerizations not normally available to substrates. d. They lower the activation energy for the conversion of substrate to product. e. To be effective they must be present at the same concentration as their substrates. 10. Which of the following is a basic amino acid? a. glutamate b. isoleucine c. threonine d. glutamine e. arginine
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11. Using the Lineweaver Burk plot below, describe the kind of inhibition exhibited and give the K M value of the enzyme without inhibitor. Plus inhibitor 0.45 units -0.95 units a. competitive inhibition; K M = 2.22 µ M b. competitive inhibition; K M = 0.95 µ M c. competitive inhibition; K M = 1.05 µ M d. mixed inhibition; K M = 2.22 µ M e. mixed inhibition; K M = 1.05 µ M 12. Which of the following statements about microfilaments is FALSE?
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finalexams06 - CH 369 Final Exam 1. A reaction such as A B...

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