APFIVE Sodium-Potassium Pump Saturation Kinetics
The table shows the rate of ion transport by a sodium-potassium pump at different ion concentrations. Which of the following conclusions is best supported by the data?
Table: Ion Transport Rates via Sodium-Potassium Pump
| Ion Concentration (mM) | Transport Rate (ions/s) |
|---|---|
| 10 | 100 |
| 20 | 190 |
| 50 | 250 |
| 100 | 270 |
A
A plateau in transport rate implies that more pump proteins are present than necessary for ion exchange across the membrane.
B
The table indicates that the sodium-potassium pump operates linearly across all ion concentrations without any saturation effects.
C
The saturation of the transport rate at high ion concentrations indicates that the pump has a maximum capacity, consistent with saturable kinetics.
D
The data suggest that the transport rate increases indefinitely with ion concentration, indicating unsaturated kinetics.
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