CAIE IGCSE Biology 3.3.3 Carrier Proteins in Active Transport

Practise explaining how specific membrane carrier proteins bind and move molecules or ions during active transport, linking movement against a gradient to respiration energy.

Exam points

identify a labelled membrane component that transports mineral ions as a carrier protein
state that carrier proteins move molecules or ions across a cell membrane during active transport
link carrier-mediated movement against a concentration gradient to energy released by respiration

[Maximum number: 2]

Fig. 3.1 is a diagram of the junction between two neurones in a healthy person.
Fig. 3.2 is a diagram of the junction between the same two neurones in a person who has Parkinson's disease. This disease affects the nervous system.

Fig. 3.1

Fig. 3.2

Cell membranes also contain protein carriers. Describe the role of protein carriers.

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3.3.3—Protein carriers move molecules or question 1