Expansins are proteins that loosen up cell walls so cells can elongate.Auxin is thought to activate expansins by
A)aligning cellulose microfibrils.
B)activating protons pumps to decrease pH in a section of the cell wall.
C)depositing lignin molecules between cellulose fibrils.
D)increasing turgor pressure.
E)increasing pectin hydration.

Question

Quizplus · Accepted Answer

Auxin activates proton pumps which decrease the pH in a section of the cell wall. This acidification activates expansins, proteins that loosen the cell wall, allowing for cell elongation.

Expansins Are Proteins That Loosen Up Cell Walls So Cells