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

Which event is directly mediated by a ligand-gated ion channel?

Activation of G-proteins leading to second messenger production

Rapid influx of ions across the plasma membrane upon ligand binding

Phosphorylation of tyrosine residues on intracellular proteins

Translocation of steroid hormone receptors to the nucleus

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Verified step by step guidance

Understand the function of ligand-gated ion channels: These are transmembrane proteins that open to allow ions to pass through the plasma membrane in response to the binding of a specific ligand (e.g., neurotransmitter).

Identify the key feature of ligand-gated ion channels: They mediate the rapid influx or efflux of ions (such as Na⁺, K⁺, Ca²⁺, or Cl⁻) across the plasma membrane, which occurs almost immediately upon ligand binding.

Eliminate options that do not involve ion movement: For example, activation of G-proteins and second messenger production is mediated by G-protein-coupled receptors, not ligand-gated ion channels. Similarly, phosphorylation of tyrosine residues is associated with receptor tyrosine kinases, and translocation of steroid hormone receptors involves intracellular receptors, not ion channels.

Focus on the correct event: The rapid influx of ions across the plasma membrane upon ligand binding is the hallmark of ligand-gated ion channel activity.

Conclude that the correct answer is the event directly mediated by ligand-gated ion channels, which is the rapid influx of ions across the plasma membrane upon ligand binding.