Use the following scenario to answer the question: a cell has an antiport protein on its apical surface. the cell is placed in a solution that contains a high concentration of na⁺ relative to the inside of the cell, and a high concentration of ca⁺⁺ relative to the inside of the cell. the antiporter will move 3 na⁺ into the cell in exchange for one ca⁺⁺ leaving the cell. this is an example of what type of transport?

Active transport.

Explanation:

The molecules may transport the plasma membrane by direct diffusion or by the use of energy. The passive transport does not require the need of ATP for transport the molecules.

Active transport requires energy in the form of ATP. The sodium is moved into the cell and calcium is moved out of the cell with the help of antiporter. This transport requires the hydrolysis of ATP for transport of the ions and hence considered as active transport.

Thus, the answer is active transport.

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