The Polar Transport of Auxin in a Plant

Multiple Choice

The polar transport of auxin in a plant

A) creates an uneven distribution of the hormone.
B) uses active 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.