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Questions and Answers
What is the primary function of centrioles during cell division?
What is the primary function of centrioles during cell division?
- Formation of cell membrane
- Synthesis of DNA
- Formation of spindle fibers (correct)
- Assembly of ribosomes
Which protein primarily composes microtubules?
Which protein primarily composes microtubules?
- Keratin
- Actin
- Myosin
- Tubulin (correct)
What is the main structural difference between microfilaments and microtubules?
What is the main structural difference between microfilaments and microtubules?
- Microfilaments are thin cylinders while microtubules are slender structures (correct)
- Microfilaments are branched while microtubules are unbranched
- Microfilaments are made up of tubulin while microtubules are made up of actin
- Microfilaments are involved in spindle fibers while microtubules maintain cell shape
Where are intermediate filaments primarily located within the cell?
Where are intermediate filaments primarily located within the cell?
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How are the microtubule triplets in a centriole arranged?
How are the microtubule triplets in a centriole arranged?
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Which cellular structures are centrioles involved in forming?
Which cellular structures are centrioles involved in forming?
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In which type of cells are intermediate filaments NOT found?
In which type of cells are intermediate filaments NOT found?
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What is the diameter range of centrioles?
What is the diameter range of centrioles?
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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
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Description
Learn about centrioles, small cylindrical structures found in animal cells, their structure, and their role in cell division.
