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

Intracellular messnegers: Hormones and Nitric Oxide

Cell Biology

14. Cell Signaling

Intracellular messnegers: Hormones and Nitric Oxide

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Multiple Choice

Nitric Oxide signals by binding to which of the following molecules?

GTPases

Nuclear Receptors

Adenyl cyclase

Guanyl cyclase

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Verified step by step guidance

Understand the role of Nitric Oxide (NO) in cell signaling. NO is a gaseous signaling molecule that can diffuse across cell membranes and is involved in various physiological processes.

Recognize that NO primarily functions by activating specific enzymes within the cell. It does this by binding to these enzymes, which then trigger a signaling cascade.

Identify the enzyme that NO binds to in order to exert its effects. In this context, NO binds to guanylyl cyclase, an enzyme that catalyzes the conversion of GTP to cyclic GMP (cGMP).

Differentiate guanylyl cyclase from other molecules listed in the options. GTPases are involved in hydrolyzing GTP, nuclear receptors are involved in gene expression regulation, and adenyl cyclase converts ATP to cyclic AMP (cAMP).

Conclude that the correct molecule that NO binds to is guanylyl cyclase, as it directly interacts with NO to produce cGMP, a secondary messenger involved in vasodilation and other cellular responses.