Question

Epinephrine acts as a signal molecules that attaches to ____ proteins.

1. ion-channel receptor
2. nuclear receptor
3. G-protein-linked receptor
4. receptor tyrosine kinase
5. intracellular receptor

Answer 1

G-protein-linked receptor

Step-by-step explanation:

Epinephrine acts via G-protein-linked receptors. The heterotrimeric G proteins located within the cell are activated by G protein-coupled receptors that span the cell membrane. Signaling molecules bind to a domain on the GPCR located outside the cell, and an intracellular GPCR domain then in turn activates a particular G protein.