Which sequence of events illustrates the steps of signal transduction?
A) First messenger to receptor molecules to second messenger to cellular response
B) Receptor molecules to first messenger to second messenger to cellular response
C) First messenger to second messenger to receptor molecules to cellular response
D) First messenger to second messenger to cellular responses to receptor
E) Prophase, metaphase, anaphase, telophase

Question

Quizplus · Accepted Answer

The sequence of events in A accurately depicts the steps of signal transduction: a first messenger (such as a hormone or neurotransmitter) binds to a receptor molecule on the cell surface, which then triggers the production of a second messenger (such as cAMP or IP3) within the cell. The second messenger then activates various cellular responses by activating enzymes, opening ion channels, or altering gene expression. The other choices either reverse the order of events or are irrelevant to signal transduction.

Which Sequence of Events Illustrates the Steps of Signal Transduction