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

15. Cytoskeleton and Cell Movement

Actin Filaments

Cell Biology

15. Cytoskeleton and Cell Movement

Actin Filaments

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Multiple Choice

Which of the following proteins are associated with actin nucleation?

Arp 2/3

ADF

Profilin

Integrin

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Verified step by step guidance

Understand the role of actin nucleation in the cell. Actin nucleation is the process that initiates the formation of new actin filaments, which are crucial for various cellular functions such as movement and structure.

Identify the proteins listed in the problem: Arp 2/3, ADF, Profilin, and Integrin. Each of these proteins has a specific role in the cell, particularly in relation to actin filaments.

Learn about the Arp 2/3 complex. This protein complex is known to initiate the nucleation of new actin filaments by creating a branch on an existing filament, which is a key step in actin filament network formation.

Examine the roles of ADF (Actin Depolymerizing Factor) and Profilin. ADF is involved in disassembling actin filaments, while Profilin binds to actin monomers and facilitates their addition to the growing end of actin filaments, but neither directly nucleates actin.

Consider the function of Integrin. Integrins are transmembrane receptors that facilitate cell-extracellular matrix adhesion, and they do not play a direct role in actin nucleation.