in-a-signal-transduction-pathway-what-role-does-a-ligand-play

Question

In a signal transduction pathway, what role does a ligand play?

Accepted Answer

It binds to a receptor to initiate a cellular response.

Answer

It provides energy for the signal transduction process.

Answer

It directly alters the DNA sequence of the target cell.

Answer

It acts as a secondary messenger within the cell.