Refer to the Figure Below Showing Concentrations of Three Ions

question 10

Multiple Choice

Refer to the figure below showing concentrations of three ions inside and outside a cell, as well as the direction of transport of each ion facilitated by a membrane protein. Which ions are moved by active transport and why?

• A) K⁺ and Na⁺, because they are present in millimolar concentrations in the cell
• B) Ca²⁺, because it is present in concentrations below the micromolar level in the cell
• C) K⁺, because it is being moved into the cell and not out of the cell
• D) K⁺, Na⁺, and Ca²⁺, because they are charged particles
• E) K⁺, Na⁺, and Ca²⁺, because they are moving from lower to higher concentration

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