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.
Answer: B
Biology & Microbiology
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