A bacterium containing sodium ions at a concentration of 0.1 mM lives in a pond that contains sodium ions at 0.005 mM.Evidently, sodium ions are entering the cell by:

Question

Quizplus · Accepted Answer

The sodium ions are moving against their concentration gradient (from lower concentration in the pond to higher concentration inside the bacterium), which requires energy, indicating active transport.

A Bacterium Containing Sodium Ions at a Concentration of 0