List, describe, and distinguish the 3 types of cytoskeletal filaments based on: the name of the...
- List, describe, and distinguish the 3 types of
cytoskeletal filaments based on:
- the name of the monomer protein
- how monomers incorporate into filaments
- polarity
- approximate diameter
- function
- associated proteins
Homework Answers
| Microtubule | Microfilament | Intermediate filament | |
| Monomer | alpha and beta tubulin | G actin | many types of proteins |
| Structure | hollow tube with a wall containing 13 protofilaments | 2 intertwined chains of F actin | 8 protofilaments joined end to end |
| Polarity | +, - | +, - | not known |
| Diameter |
outer - 25 nm Inner - 15 nm |
7 nm | 8 to 12 nm |
| Function |
maintenance and Organisation of animal cell shape and polarity Movement of chromosomes during cell division Intracellular transport Cell motility |
Muscle contraction cell locomotion cytoplasmic streaming maintenance of animal cell shape cytokinesis intracellular transport |
Structural support maintenance of animal cell shape Formation of nuclear lamina |
| Protein | tubulin | actin | desmin, neurofilament protein, keratin and many others |
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