Auxin moves between cells through a process called polar transport. Auxin molecules move from one cell to the next through PIN proteins. However, their movement is unidirectional. What accounts for this unidirectional movement?
A. PIN proteins are only found on the basal
side of the cell.
B. PIN proteins are only found on the apical
side of the cell.
C. Auxin diffuses down its concentration
gradient. The concentration of auxin
molecules decreases as you move down the
stem away from the apical meristem.
D. Auxin moves independently of its
concentration gradient because the presence
of the PIN protein provides a channel that
auxin can "leak" through to get into adjacent
cells.
E. Auxin in the unprotonated form can move
between cells by going into adjacent spaces
occupied by plant cell walls. The movement
of auxin is lateral, not unidirectional.
A
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