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

Intracellular receptors usually contain binding sites for which of the following types of molecules?

Ions such as calcium and sodium

Hydrophobic signaling molecules such as steroid hormones

Hydrophilic peptide hormones

Cell-surface carbohydrates

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Verified step by step guidance

Understand the role of intracellular receptors: Intracellular receptors are located inside the cell, typically in the cytoplasm or nucleus, and they bind to signaling molecules that can cross the cell membrane.

Identify the types of molecules that can cross the cell membrane: Only small, nonpolar, or hydrophobic molecules can diffuse through the lipid bilayer of the cell membrane without the need for transport proteins.

Eliminate options that cannot cross the membrane: Hydrophilic molecules, such as peptide hormones and ions (e.g., calcium and sodium), cannot pass through the hydrophobic core of the lipid bilayer and therefore cannot bind to intracellular receptors.

Focus on hydrophobic signaling molecules: Steroid hormones, which are hydrophobic, can diffuse through the cell membrane and bind to intracellular receptors. These receptors often act as transcription factors, regulating gene expression.

Conclude that the correct answer is hydrophobic signaling molecules such as steroid hormones, as they are the only type of molecule listed that can bind to intracellular receptors.