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

Phosphoinositide Signaling Pathways

Cell Biology

14. Cell Signaling

Phosphoinositide Signaling Pathways

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Multiple Choice

Which of the following molecules removes phosphates from PI-3 kinase?

Phospholipase C

Phosphatidylinositol-3 kinase

PTEN Phosphatase

Protein Kinase C

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Verified step by step guidance

Understand the role of PI-3 kinase: PI-3 kinase is an enzyme that phosphorylates the 3' position of the inositol ring of phosphatidylinositol lipids, which is a crucial step in cell signaling pathways.

Identify the function of PTEN Phosphatase: PTEN (Phosphatase and Tensin Homolog) is a phosphatase enzyme that specifically removes phosphate groups from the 3' position of the inositol ring, counteracting the action of PI-3 kinase.

Differentiate between kinases and phosphatases: Kinases add phosphate groups to molecules, while phosphatases remove them. This distinction is key to understanding their roles in signaling pathways.

Evaluate the options: Phospholipase C and Protein Kinase C are involved in different signaling pathways and do not remove phosphates from PI-3 kinase products. Phosphatidylinositol-3 kinase is the enzyme that adds phosphates, not removes them.

Conclude with the correct answer: PTEN Phosphatase is the enzyme that removes phosphates from the products of PI-3 kinase, thus regulating the signaling pathway.