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All G-protein-linked receptors share one structural feature even though their extracellular domains and G-protein-binding sites differ. What is that shared feature?
ASeven transmembrane domains
BA single membrane-spanning helix
CThree ligand-binding pockets
DAn intracellular kinase domain
Answer & Solution
Correct answer: A. Seven transmembrane domains
1. G-protein-linked receptors bind a ligand and activate a membrane protein called a G-protein.
2. All receptors of this type share seven transmembrane domains.
3. Even though the transmembrane structure is shared, each receptor still has its own extracellular domain and G-protein-binding site.
4. A single alpha-helical membrane-spanning region instead describes enzyme-linked receptors, which is a different receptor category from the one in the stem.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 9 "Cell Communication", section 9.1 Signaling Molecules and Cellular Receptors_
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