Cells elongate in response to auxin. All of the following are part of the acid growth hypothesis except
A)Auxin stimulates proton pumps in cell membranes.
B)Lowered pH results in the breakage of cross-links between cellulose microfibrils.
C)The wall fabric becomes looser (more plastic).
D)Auxin-activated proton pumps stimulate cell division in meristems.
E)The turgor pressure of the cell exceeds the restraining pressure of the loosened cell wall, and the cell takes up water and elongates.

Question

Quizplus · Accepted Answer

The acid growth hypothesis proposes that auxin stimulates proton pumps in cell membranes, which results in lowered pH and the breakage of cross-links between cellulose microfibrils. As a result, the wall fabric becomes looser and more plastic, allowing the cell to elongate when the turgor pressure exceeds the restraining pressure of the loosened cell wall. However, the hypothesis does not propose that auxin-activated proton pumps stimulate cell division in meristems.

Cells Elongate in Response to Auxin