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

6. Proteins

Protein Basics

Cell Biology

6. Proteins

Protein Basics

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Multiple Choice

Which protein is correctly matched with the cytoskeletal filament it primarily composes?

Actin – Microfilaments

Keratin – Microtubules

Tubulin – Intermediate filaments

Vimentin – Microfilaments

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Verified step by step guidance

Understand the three main types of cytoskeletal filaments: microfilaments, intermediate filaments, and microtubules. Each type is composed of specific proteins and serves distinct functions in the cell.

Recall that microfilaments are primarily composed of actin. These filaments are involved in cell shape, motility, and intracellular transport.

Review that intermediate filaments are composed of various proteins depending on the cell type, such as keratin in epithelial cells and vimentin in mesenchymal cells. They provide mechanical support and maintain cell integrity.

Note that microtubules are composed of tubulin (α-tubulin and β-tubulin dimers). They are involved in intracellular transport, mitotic spindle formation, and maintaining cell shape.

Match each protein to its corresponding cytoskeletal filament: Actin – Microfilaments, Keratin – Intermediate filaments, Tubulin – Microtubules, and Vimentin – Intermediate filaments. Identify the correct pairing based on this information.