The researchers discovered a new proton pump that is involved in phloem unloading in the sugar storage tissue.Predict the movement of ions carried out by this pump.

Question

Quizplus · Accepted Answer

The researchers discovered a new proton pump involved in phloem unloading in the sugar storage tissue. This suggests that the direction of proton movement is from vacuole to cytoplasm because the pump is involved in unloading sugars from the phloem into the storage tissue. Thus, active transport of protons from vacuole to cytoplasm is the best choice. Options A and B can be ruled out because they involve proton movement into the vacuole, which is not consistent with the pump's role in unloading sugars. Option D is incorrect because it suggests movement of sugar from the cytoplasm to the vacuole, which is opposite to the direction of sugar movement in phloem unloading. Option E is also incorrect because passive transport does not involve the use of a proton pump.

The Researchers Discovered a New Proton Pump That Is Involved