Auxin triggers the acidification of cell walls, which results in rapid growth, but also stimulates sustained, long-term cell elongation. What best explains how auxin brings about this dual growth response?
A) Auxin binds to different receptors in different cells.
B) Different concentrations of auxin have different effects.
C) Auxin causes second messengers to activate both proton pumps on the plasma membrane and certain genes within the same cells.
D) The dual effects are due to two different types of auxins that are produced by different genes.
E) Other antagonistic hormones modify auxin's effects.

Question

Quizplus · Accepted Answer

Auxin causes second messengers to activate both proton pumps on the plasma membrane and certain genes within the same cells, leading to both rapid growth and sustained, long-term cell elongation. Different concentrations of auxin or binding to different receptors would not explain the dual growth response. The existence of two different types of auxins or antagonistic hormones would require additional information not provided in the question.

Auxin Triggers the Acidification of Cell Walls, Which Results in Rapid