Beckers World of the Cell Study Set 1
Quiz 8 :
Transport Across Membranes
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Q29 Q29 Q29
The graph below shows the concentrations of B and C inside the cell over time when the cell that has imported B and C in Figure 8.1 above is transferred to a solution containing a much lower concentration of B and C.Based on these data and coupled with the data observed above,substance C is transported via
Q55 Q55 Q55
The bacterium Brucella abortus imports and uses the unusual sugar erythritol.The concentration of erythritol within the B.abortus cell is 10 mM,but the external erythritol concentration is much lower at 0.20 mM.What is the energy requirement (ΔG inward in kcal/mol)for the inward transport of erythritol at 37°C under these conditions?
Q58 Q58 Q58
Urea is a small molecule that is transported out of most cells by passive diffusion,but some cells,including kidney cells,have urea-facilitated transporters.Given an assay to measure the amount of urea on one side of the cell plasma,design an experiment to distinguish which mechanism an uncharacterized cell you have isolated uses to transport urea.Include graphs,if this aids in your discussion.