AQA · Biology · 8461
GCSE Biology: Active transport
Cell biology · AQA GCSE Biology (8461), specification point 4.1.3.3. Cards are generated from the exam board's own specification for "Active transport", and every card links back to the page it came from. Specification © AQA — used with attribution.
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Define active transport.
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The movement of substances from a more dilute solution to a more concentrated solution (against a concentration gradient), using energy from respiration.
Active transport moves substances ? a concentration gradient.
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against
Where does the energy for active transport come from?
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Respiration.
How do plant root hair cells absorb mineral ions from very dilute soil solutions?
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By active transport — the ions are moved against their concentration gradient using energy from respiration.
Why do plants need to absorb mineral ions from the soil?
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Plants require ions for healthy growth.
Which process absorbs sugar molecules from the gut into the blood against a concentration gradient?
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Active transport.
Why must sugar be absorbed from the gut into the blood by active transport rather than diffusion?
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The blood already has a higher sugar concentration than the gut, so sugar must be moved against its concentration gradient, which requires energy.
What are absorbed sugar molecules used for in cells?
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Cell respiration.
What is the key difference between active transport and diffusion?
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Active transport moves substances against a concentration gradient and requires energy from respiration; diffusion moves substances down a concentration gradient and needs no energy.
Which three processes transport substances into and out of cells?
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Diffusion, osmosis and active transport.
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