435_samp1_2009_KEY

435_samp1_2009_KEY - Biology 435 Sample Exam Questions for...

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Biology 435 Sample Exam Questions for 1 st Midterm – KEY (Correct answers shown in bold font) 1. Which of the following is a false statement? a. The First Law of Thermodynamics describes energy changes associated with both reversible and irreversible processes; b. Most processes observed in biological systems are readily reversible in a thermodynamic sense; c. The Second Law of Thermodynamics allows us to understand why some processes are irreversible; d. a & b; e. a & c; 2. When glucose is catabolized to CO 2 and H 2 O, the Gibbs Free Energy change accompanying the reaction is approximately - 686 kcal/mole. Which of the following 'processes' make(s) an important contribution to the change in G? a. Release of energy 'contained in' the covalent bonds of the glucose molecules; b. Entropy production; b. The energy of activation of the overall reaction; c. a & b; d. All of the above contribute to the change in G; 3. TRUE or FALSE (Circle one, please). The gradient driving passive flux of a solute through a barrier, such as a plasma membrane, is entirely the result of concentrations differences across the barrier. If you circled TRUE, what is the coefficient of proportionality between the driving force and the flux? If you circled FALSE, rewrite the statement so that it's true. The gradient driving passive flux of a solute through a barrier, such as a plasma membrane, is the result of chemical potential (or electrochemical) gradients across the barrier. 4. What is the Goldman Equation, and what is its significance? The Goldman Equation relates the membrane potential (V m ) to the rate at which ions are diffusing through the plasma membrane (and therefore separating charge across the membrane) 5. Consider the equivalent circuit model of an excitable cell's plasma membrane. You'll recall (I hope) that a number of 'batteries' (or emf's), a capacitor, and some variable resistances are part of the diagram. What does each of these represent in an actual neuron? Component
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This note was uploaded on 04/20/2010 for the course BICD 100 taught by Professor Nehring during the Spring '08 term at UCSD.

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435_samp1_2009_KEY - Biology 435 Sample Exam Questions for...

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