Vacuoles · Botany

The tonoplast contains 'Aquaporins'. What is their specific role?

  1. To actively pump protons into the vacuole lumen
  2. To bind and store DNA within the cell sap
  3. To produce ATP through cellular respiration
  4. To facilitate rapid movement of water molecules
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Correct answer: To facilitate rapid movement of water molecules

Aquaporins are channel proteins that allow water to flow across the membrane much faster than simple diffusion. They are critical for the rapid adjustments in turgor pressure and cell volume.

Difficulty: Medium Question 17 of 20

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