Which of the Following Provides the Best Evidence That Cell-Signaling

Multiple Choice

Which of the following provides the best evidence that cell-signaling pathways evolved early in the history of life?

A) Cell-signaling pathways are seen in "primitive" cells such as bacteria and yeast.
B) Bacteria and yeast cells signal each other in a process called quorum sensing.
C) Signal transduction molecules identified in distantly related organisms are similar.
D) Most signals in all types of cells are received by cell surface receptors.