Cambridge IGCSE Biology practice
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Topic
Active transport
Exam-style question
Active transport in cells
Description
Protein carriers transport molecules or ions across a membrane during active transport, which requires energy.
State the role of protein carriers in active transport.
Aim for approximately 1 distinct marking point.
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Diagram Description
A protein carrier in the cell membrane binds to a molecule outside the cell and uses energy to change shape and move the molecule inside the cell against its concentration gradient.
Identify what provides the energy for the protein carrier to transport molecules.
Aim for approximately 1 distinct marking point.