8 Questions
What is the primary function of centrioles during cell division?
Formation of spindle fibers
Which protein primarily composes microtubules?
Tubulin
What is the main structural difference between microfilaments and microtubules?
Microfilaments are thin cylinders while microtubules are slender structures
Where are intermediate filaments primarily located within the cell?
Outside the nucleus
How are the microtubule triplets in a centriole arranged?
In a cylindrical array
Which cellular structures are centrioles involved in forming?
Cilia and flagella
In which type of cells are intermediate filaments NOT found?
Higher plant cells
What is the diameter range of centrioles?
0.2 µm
Study Notes
Cell Organelles: Centrioles
- Small, cylindrical structures found in animal cells, some lower plants, and microscopic organisms
- Measure 0.2 µm in diameter and 0.3-0.5 µm long
- Composed of nine microtubule triplets arranged in a cylindrical array
- Typically found in pairs, perpendicular to each other, near the nucleus
- Replicate and migrate to opposite sides of the nucleus during cell division
- Involved in the formation of spindle fibers during cell division
- Play a role in the formation of cilia and flagella
Microtubules
- Long, unbranched, slender structures composed of tubulin protein
- Involved in the assembly and disassembly of other cellular components
Microfilaments
- Thinner cylinders made up of the contractile protein actin
- Linked to the inner face of the plasma membrane
- Involved in cell movement, determining the shape of the cell, and maintaining its shape
Intermediate Filaments
- Located outside of the nucleus
- Found in animal cells, but not in higher plants
- Involved in the determination of cell components
Learn about centrioles, small cylindrical structures found in animal cells, their structure, and their role in cell division.
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