A Cell Is Placed into a 1 Millimolar Solution of Substance

question 32

Multiple Choice

A cell is placed into a 1 millimolar solution of substance X and over time you witness the concentration of X inside the cell increase to 5 millimolar. What is the best explanation for this observation?

• A) X is moving into the cell by simple diffusion.
• B) X is moving into the cell by diffusion through a protein channel.
• C) X is moving into the cell by facilitated diffusion.
• D) X is moving into the cell by primary active transport.
• E) Water is leaving the cell by osmosis.

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