How do G protein detection orders from old factory?

Heterotrimeric G proteins located within the cell are activated by G protein-coupled receptors (GPCRs) that span the cell membrane. Signaling molecules bind to a domain of the GPCR located outside the cell, and an intracellular GPCR domain then in turn activates a particular G protein.

Explanation:

and after water is usually warmed by the sun the water temperature raises and then evaporates .