The Cells That Have Phosphorylated Phototropin Receptors Elongate in Response

Question

The cells that have phosphorylated phototropin receptors elongate in response to blue light.

Accepted Answer

Phototropin receptors, when phosphorylated, initiate a signaling cascade that leads to the redistribution of auxin, a plant hormone. It is the differential distribution of auxin that causes cells on the darker side of the plant to elongate, directing plant growth towards the light, rather than the phosphorylated phototropin receptors directly causing cell elongation.