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Learning objective

Explain co-transport mechanisms in biological contexts.

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Topic

Cells official content

Subtopic

Transport across cell membranes

Aqa A Level BiologyCells

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Quick explanation

Explain co-transport mechanisms in biological contexts

  • This point belongs to Cells official content, especially Transport across cell membranes.
  • You need to be able to explain co-transport mechanisms in biological contexts.
  • The key ideas to know are co-transport.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

co-transport

Why it matters

This objective helps connect Transport across cell membranes to exam-style questions, flashcards, and revision notes for Cells official content.

Quick student answer

Which of the following best describes the process of co-transport in cells?

Direct answer

Co-transport involves the simultaneous transport of two different molecules across a membrane through a specific transport protein.

Key terms

  • Electrochemical gradient: The gradient of electrochemical potential, usually for an ion that can move across a membrane, which influences the movement of ions and molecules.
  • Active transport: The movement of molecules across a membrane against their concentration gradient, requiring energy, typically from ATP.

Common trap

Confusing co-transport with simple diffusion: Clarify that co-transport requires specific transport proteins and is dependent on the concentration gradient of one of the substances.

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