What are receptors?
Proteins that bind to ligands and initiate a response
Proteins that transport ligands across cell membranes
Proteins that break down ligands into smaller molecules
Proteins that store ligands inside cells
Receptors are proteins that are located on the surface of cells or inside cells. They are responsible for recognizing and binding to specific ligands, such as hormones, neurotransmitters, or drugs. When a ligand binds to a receptor, it can initiate a cellular response, such as a change in gene expression or the opening of ion channels.
Option 1 is the correct answer.