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Membrane Transport Investigation

Compare concentration traces and distinguish passive transport from an energy-dependent process.

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In the model, a solute moves from low to high concentration. When ATP is removed, the movement stops. Which kind of transport fits best?

Active transport, driven by energy from ATP.Passive diffusion down the concentration gradient.

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Use both clues: direction first, then what changes in the run with energy removed.

About this activity

What you practise: Classifying membrane transport from two clues: the direction relative to the gradient and the dependence on energy.

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In the model, a solute moves from low to high concentration. When ATP is removed, the movement stops. Which kind of transport fits best? The table compares two model runs. With ATP, the solute moves from low to high concentration, against the gradient. Without ATP, the movement stops and the gradient stays as it is. Passive transport follows a concentration or electrochemical gradient. Here the observed movement is against the gradient and the change depends on the energy condition, so the evidence supports active transport.