A-LevelBiologyCell membranes and transport9700/12 · Feb/Mar 2018 · Q191 Mark
Companion cells use ATP to move hydrogen ions out of the cell and co-transporter proteins to allow hydrogen ions to return with sucrose molecules. Which two processes are involved in this movement?
Aactive transport and diffusion
Bactive transport and facilitated diffusion
Cexocytosis and diffusion
Dexocytosis and facilitated diffusion
✓ Correct answer
B: active transport and facilitated diffusion
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