35. A Sodium-potassium (Na-K) pump (which is an example of
active transport) uses ATP energy to pump 2 potassium (K+) ions into the cytoplasm
while moving 3 sodium (Na+) ions out at the same time. As the Na+ leaks back
into the cytoplasm through the coupled protein channel, it provides energy to
escort a sugar molecule into the cytoplasm.
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Slichter