BRAINCAKEProtein Channels
Channel proteins form water-filled pores across the bilayer through which specific solutes can diffuse.
Small polar molecules and ions pass through the hydrophilic channels or pores formed by proteins that span the membrane. Each protein only allows the passage of one particular ion or molecule so is specific.
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More in Transport Across Cell Membranes
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All 22 lessons in Transport Across Cell Membranes · All AQA AS-level Biology topics