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 is true of transporters in the context of cell surface receptors?

They transmit electrical signals by opening in response to voltage changes.

They function primarily as enzymes that catalyze intracellular reactions.

They facilitate the movement of specific molecules across the cell membrane.

They directly generate second messengers upon ligand binding.

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Verified step by step guidance

Understand the role of transporters: Transporters are membrane proteins that facilitate the movement of specific molecules, such as ions, sugars, or amino acids, across the cell membrane. They are not involved in transmitting electrical signals or generating second messengers.

Eliminate the incorrect options: The first option refers to ion channels, which open in response to voltage changes and transmit electrical signals. Transporters do not perform this function.

Eliminate the second incorrect option: The second option describes enzymes that catalyze intracellular reactions. Transporters are not enzymes; their primary role is to move molecules across the membrane.

Eliminate the third incorrect option: The fourth option refers to receptors like G-protein-coupled receptors, which generate second messengers upon ligand binding. Transporters do not directly generate second messengers.

Confirm the correct answer: The correct statement is that transporters facilitate the movement of specific molecules across the cell membrane. This is their primary function in the context of cell surface receptors.