A Hormonal Signal is Detected by ____

Question

A hormonal signal is detected by ____.  
A) chloroplasts
B) transport proteins
C) receptor proteins
D) statoliths
E) plasma membranes

Accepted Answer

Hormonal signals bind to receptor proteins on the surface of target cells to initiate a response. Chloroplasts and statoliths are not involved in hormone signaling, while plasma membranes and transport proteins may play a role in the movement of hormones within the cell but do not directly detect the signals.