3.3 Active transport (3)

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1.

Describe active transport as the movement of particles through a cell membrane from a region of lower concentration to a region of higher concentration, using energy from respiration. In your answer, explain the role of carrier proteins and the process of saturation.

2.

Explain the difference between active transport and facilitated diffusion. In your answer, describe how the process of facilitated diffusion works and identify a factor that can affect its rate.

3.

State that protein carriers move molecules or ions across a membrane during active transport. Explain how this process requires energy and describe the role of the protein carrier in this process.