membrane transport practice problems key

membrane transport practice problems key - Membrane...

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Membrane Transport Practice Problems First try these problems from Chapter 13 of your book (Berg et al., Biochemistry 6 th edition ), pages 379 – 380. Problems: 2, 3, 5, 6, 8, 14 (parts a and b only), and 20 (Note: You can find the structure of tetradoxin on page 364) Answers in the back of your book Then try these: 1. For this problem, assume the cell has a membrane potential of -60 mV with the interior negative with respect to the exterior, and is being kept at a constant temperature of 25 °C. a) The concentration of glucose outside of a given cell is 5mM and inside the cell is 150 mM. Calculate the free energy change for the transport of glucose into the cell at 25 °C? For an uncharged solute (glucose) Δ G = RT ln ( C 2 / C 1 ) where C1 is the concentration of solute where it is moving from and C2 is the concentration of solute where it is moving to Δ G = (8.314 J/mol K)(298 K)(ln(150 mM/5 mM) Δ G = 8.43 kJ/mol What type of transport protein could be mediating the movement of glucose into the cell under these conditions? Explain your answer.
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