Quiz 8 Key |
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1-4. Answer with diffusion through (B) the bilayer; (N) a channel; (R) a carrier.
Answer with only one even if two are correct. Use each letter at least once.
N requires a protein that does not change conformation |
R alanine moves across a membrane |
B N not saturable |
B CO2 moves across a membrane |
5-6. ΔGT = R T ln (C2/C1) + Z F ΔV. Answer with R, T, C2, C1, Z, F, or ΔV.
C1 [solute] outside a cell when the solute is moving out → in |
ΔV the membrane potential |
7-8. The concentration term = R T ln (C2/C1), and the charge term = Z F ΔV.
Shortly after a meal, [lysine]extracellular is much greater than [lysine]intracellular .
Answer with (>) greater than; (<) less than; or (=) equal to.
Moving lysine into the cell has a concentration term < 0 and a charge term < 0.
9-10. Draw the structure of lysine at pH 7.
NOTE: I'm not going to show the structures of the amino acids. It is important, though, to recognize that lysine at pH 7 has a net charge of +1; that's the reason the charge term for moving lysine into the cell is negative [= (+1) F (− membrane potential)].
1-4. Answer with diffusion through (B) the bilayer; (N) a channel; (R) a carrier.
Answer with only one even if two are correct. Use each letter at least once.
B O2 moves across a membrane |
N involves a gated protein |
R requires a protein that changes |
N R K+ moves across a membrane |
5-6. ΔGT = R T ln (C2/C1) + Z F ΔV. Answer with R, T, C2, C1, Z, F, or ΔV.
R 8.314 J/mol |
Z +2 for moving calcium |
7-8. The concentration term = R T ln (C2/C1), and the charge term = Z F ΔV.
For red blood cells in the lungs [HCO3−]intracellular is much greater than [HCO3−]extracellular .
Answer with (>) greater than; (<) less than; or (=) equal to.
Moving HCO3− into the cell has a concentration term > 0 and a charge term >* 0.
*When I made up the quiz, I thought of moving only HCO3-, which would have a positive charge term [= (−1) F (− membrane potential)]. As I graded this, I realized that in that case the question should have been "Moving only HCO3− into the cell..." Since the question was less explicit, and we had just covered the bicarbonate-chloride co-transporter, = 0 is also acceptable.
9-10. Draw the structure of tyrosine at pH 7.
1-4. Answer with diffusion through (B) the bilayer; (N) a channel; (R) a carrier.
Answer with only one even if two are correct. Use each letter at least once.
R saturable |
R lysine moves across a membrane |
B CO2 moves across a |
N R requires a protein with a specific binding site |
5-6. ΔGT = R T ln (C2/C1) + Z F ΔV. Answer with R, T, C2, C1, Z, F, or ΔV.
Z −1 for moving bicarbonate |
F 96,480 J/V-mol |
7-8. The concentration term = R T ln (C2/C1), and the charge term = Z F ΔV.
Shortly after a meal, [glucose]extracellular is much greater than [glucose]intracellular .
Answer with (>) greater than; (<) less than; or (=) equal to.
Moving glucose into the cell has a charge term < 0 and a concentration term = 0.
9-10. Draw the structure of threonine at pH 7.
1-4. Answer with diffusion through (B) the bilayer; (N) a channel; (R) a carrier.
Answer with only one even if two are correct. Use each letter at least once.
N involves a gated protein |
B does not require a protein |
N R Na+ moves across a membrane |
R glucose moves across a membrane |
5-6. ΔGT = R T ln (C2/C1) + Z F ΔV. Answer with R, T, C2, C1 1 , Z, F, or ΔV.
T 298 K |
C2 [solute] inside a cell when the solute is moving out → in |
7-8. The concentration term = R T ln (C2/C1), and the charge term = Z F ΔV.
For red blood cells in the tissues [HCO3−]extracellular is much greater than [HCO3−]intracellular .
Answer with (>) greater than; (<) less than; or (=) equal to.
Moving HCO3−into the cell has a concentration term < 0 and a charge term >* 0.
9-10. Draw the structure of histidine at pH 7.
*When I made up the quiz, I thought of moving only HCO3-, which would have a positive charge term [= (−1) F (− membrane potential)]. As I graded this, I realized that in that case the question should have been "Moving only HCO3− into the cell..." Since the question was less explicit, and we had just covered the bicarbonate-chloride co-transporter, = 0 is also acceptable.