Respuesta :
A signal transduction pathway is initiated when a specific binds to its receptor like a signal molecule.
What is a Signal Molecule?
As a broad term for molecules that particularly attach to other molecules, "ligand" is frequently used to refer to signalling molecules (such as receptors). Multicellular organisms communicate between their cells via a wide variety of chemicals. There is a lot of variation in the structure and function of the many types of molecules that work as signal transmitters, even though all of these molecules act as ligands that bind to receptors expressed by their target cells. The signalling molecules utilised by plants and animals differ greatly in structural complexity, ranging from basic gases to proteins.
What are the pathways for signal transduction?
In order to elicit a response, the signal transduction pathway involves the binding of extracellular signalling molecules and ligands to receptors either inside or on the cell surface. In turn, the reaction may change the metabolism, structure, and gene expression of the cell.
So, the right answer is Signal Molecule.
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