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Usually, receptors are proteins found on or within the membrane. Many different types of molecules can bind to receptors on the cell surface, including hormones. An insulin receptor is an example of a receptor that binds to a hormones, specifically insulin.
1. A ligand is... a small molecule that binds to the alpha subunit of the G-protein. a small molecule that binds to a membrane-bound receptor. a large molecule that binds to the alpha subunit of the G-protein.a large molecule that binds to a membrane-bound receptor.s a result of the ligand binding to its site... the G-protein changes conformation and GTP replaces the GDP on the alpha subunit. the G-protein changes conformation and the alpha subunit separates from the beta and gamma subunits. the G-protein changes conformation and GDP replaces the GTP on the alpha subunit.