Multiple Choice
The polar transport of auxin in a seedling
A) occurs in parenchyma cells. 
B) uses passive membrane transporters to move auxin in and out of cells.
C) uses membrane pumps to move hydrogen ions out of the cytoplasm into the primary cell wall.
D) activates enzymes that loosen cross-links between cellulose microfibrils.
E) does all of these.
Correct Answer:
Verified
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B) herbicides.
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