Table of contents

1. Overview of Cell Biology2h 49m
2. Chemical Components of Cells1h 14m
3. Energy1h 33m
4. DNA, Chromosomes, and Genomes2h 31m
5. DNA to RNA to Protein2h 31m
6. Proteins1h 36m
7. Gene Expression1h 42m
8. Membrane Structure1h 4m
- The Lipid Bilayer
  38m
- Membrane Proteins
  25m
9. Transport Across Membranes1h 52m
10. Anerobic Respiration1h 5m
11. Aerobic Respiration1h 11m
12. Photosynthesis52m
13. Intracellular Protein Transport2h 18m
14. Cell Signaling1h 28m
15. Cytoskeleton and Cell Movement1h 39m
16. Cell Division3h 5m
17. Meiosis and Sexual Reproduction50m
18. Cell Junctions and Tissues48m
19. Stem Cells13m
- Stem Cells
  13m
20. Cancer44m
21. The Immune System1h 6m
22. Techniques in Cell Biology1h 41m

14. Cell Signaling

Overview of Cell Surface Receptors

Cell Biology

14. Cell Signaling

Overview of Cell Surface Receptors

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Multiple Choice

G-protein coupled receptors are examples of what type of effector pathway?

Direct gene activation pathway

Enzyme-linked receptor pathway

Ion channel-linked pathway

Second messenger pathway

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Verified step by step guidance

Understand the role of G-protein coupled receptors (GPCRs): GPCRs are a large family of membrane receptors that transmit signals from extracellular molecules (ligands) to intracellular signaling pathways.

Recognize the mechanism of GPCR activation: When a ligand binds to a GPCR, it activates an associated G-protein by causing the exchange of GDP for GTP on the G-protein's alpha subunit.

Identify the downstream signaling: The activated G-protein can interact with various effectors, such as enzymes (e.g., adenylyl cyclase or phospholipase C), which generate second messengers like cyclic AMP (cAMP) or inositol trisphosphate (IP3).

Clarify the term 'second messenger pathway': Second messengers are small intracellular molecules that amplify and propagate the signal initiated by the GPCR. Examples include cAMP, IP3, and calcium ions.

Conclude that GPCRs are associated with second messenger pathways, as their primary function is to activate intracellular signaling cascades through the production of these second messengers.