Signal transduction pathways
A) are found strictly in multicellular organisms, which require cell-to-cell communication.
B) originally evolved in vertebrates.
C) are mechanisms of communication that probably evolved in ancient prokaryotes.

Question

Quizplus · Accepted Answer

Signal transduction pathways are mechanisms of communication between cells that allow them to respond to external signals such as hormones, neurotransmitters, and growth factors. It is likely that these pathways evolved in ancient prokaryotes as a way of sensing and responding to changes in their environment. While multicellular organisms do rely on signal transduction pathways for communication between cells, they are not the only organisms to use these mechanisms.

Signal Transduction Pathways