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 of the following statements accurately describes receptor tyrosine kinases (RTKs)?

RTKs are G protein-coupled receptors that activate second messengers.

RTKs are transmembrane proteins that phosphorylate tyrosine residues upon ligand binding.

RTKs are intracellular receptors that bind steroid hormones.

RTKs function primarily as ion channels in the plasma membrane.

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Verified step by step guidance

Understand the role of receptor tyrosine kinases (RTKs) in cell signaling. RTKs are a class of transmembrane proteins that play a critical role in signal transduction by phosphorylating tyrosine residues on themselves or other proteins upon ligand binding.

Eliminate the incorrect option: 'RTKs are G protein-coupled receptors that activate second messengers.' RTKs are not G protein-coupled receptors (GPCRs). GPCRs use G proteins and second messengers like cAMP, whereas RTKs directly phosphorylate tyrosine residues.

Eliminate the incorrect option: 'RTKs are intracellular receptors that bind steroid hormones.' Intracellular receptors typically bind hydrophobic molecules like steroid hormones and are located inside the cell, whereas RTKs are transmembrane proteins located on the cell surface.

Eliminate the incorrect option: 'RTKs function primarily as ion channels in the plasma membrane.' RTKs do not function as ion channels. Ion channels allow the passage of ions across the membrane, while RTKs are involved in phosphorylation and signal transduction.

Conclude that the correct statement is: 'RTKs are transmembrane proteins that phosphorylate tyrosine residues upon ligand binding.' This accurately describes the structure and function of RTKs in cell signaling.