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Question
A plant cell was put into a solution of substance A at a concentration of 200 mmol/L. The rate of uptake into the cell was measured as 5 mmol/minute. When the cell was placed in a solution of substance A at a concentration of 400 mmol/L, the rate of uptake was 10 mmol per minute. When the experiment was repeated with substance B, the rate of uptake was 10 mmol per minute at both concentrations of the substance. Which of the following provides the best explanation of the results?
A plant cell was put into a solution of substance A at a concentration of 200 mmol/L. The rate of uptake into the cell was measured as 5 mmol/minute. When the cell was placed in a solution of substance A at a concentration of 400 mmol/L, the rate of uptake was 10 mmol per minute. When the experiment was repeated with substance B, the rate of uptake was 10 mmol per minute at both concentrations of the substance. Which of the following provides the best explanation of the results?
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Solution
The correct option is A Substance A appears to move into the cell by active transport, and B by diffusion
In the active transport, as the concentration of the solution increases, so does the amount of uptake in a cell. And in diffusion, the amount of the uptake of a substance in a cell is usually not affected by the concentration of the solution.
So, the correct answer is 'Substance A appears to move into the cell by active transport and B by diffusion'.
In the active transport, as the concentration of the solution increases, so does the amount of uptake in a cell. And in diffusion, the amount of the uptake of a substance in a cell is usually not affected by the concentration of the solution.
So, the correct answer is 'Substance A appears to move into the cell by active transport and B by diffusion'.
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