A Plant Hormone May Have Different Effects on Target Cells

Multiple Choice

A plant hormone may have different effects on target cells due to any of the following except ____________.  

A) differences in location relative to the ground
B) the integration of several hormonal signals in the tissue
C) the action of a cell's hormone receptors upon binding to the hormone
D) different gene expression patterns triggered by the hormone
E) the concentration of the hormone in the tissue