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Transcript
Chapter 5, Lesson 6 Notes The Cytoskeleton Cytoskeleton Structure Composed of a network of protein fibers called microfilaments, intermediate filaments, and microtubules. Cytoskeleton Function 1. gives cells support and helps the cell keep its shape 2. anchors organelles into a certain position or allows them to move around in the cell 3. allows cells to move by functioning as a muscle Types of Cytoskeleton Fibers 1. Microfilaments – made of strings of ball-shaped proteins called actin. The actin are twisted together to make long fiber molecules. They are mainly responsible for moving the whole cell around. 2. Intermediate filaments – made from long, string-like proteins, they coil together like rope to form rods that add strength to the shape of the cell. 3. Microtubules – made from units of a ball-shaped protein called tubulin. The tubulin molecules come together to form a hollow tube that supports the cell’s shape. Microtubules’ Function Outside the Cell Outside the cell, the microtubules anchor to and extend out of the plasma membrane. They form two types of structures—cilia and flagella. Both cilia and flagella are made of microtubules. (draw and label the picture of the eukaryotic cell on p. 155)