February 5, 2007

February 5, 2007 - February 5 2007 The Cytoskeleton The...

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February 5, 2007 The Cytoskeleton The eukaryotic cytoplasm has a set of long, thin fibers called the cytoskeleton, which plays 3  important roles in cellular structure and function: 1. Maintains cell shape and support 2. Provides for various types of cell movement 3. Helps move things within the cell   3 important components of the cytoskeleton Microfilaments Intermediate filaments Microtubules   Microfilaments Made up of the protein actin   2 major roles 1. They help the cell or parts of the cell to move 2. They stabilize cell shape   Intermediate filaments Made up of fibrous proteins that are organized into tough, ropelike assemblages   2 structural functions Stabilize cell structure Resist tension   Microtubules Long, hollow cylinders made up of many molecules of the protein tubulin Tubulin consists of 2 subunits: alpha-tubulin and beta-tubulin   2 major roles Form a rigid internal skeleton Act as a framework along which motor proteins can move structures in the cell   Microtubules are dynamic: Microtubules lengthen or shorten by adding or subtracting tubulin dimers Microtubule organizing center Serve as tracks for motor proteins Move along the microtubules Distribute chromosomes to daughter cells during cell division   Cilia and Flagella: Facilitate cell movement 5
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February 5, 2007 Flagella are long and whip-like Found singly or in pairs Cilia are short and are found in large numbers Both made up of microtubules 1 unpaired (unfused) set of microtubules, surrounded by 9 fused pairs of  microtubules Movement of microtubules Cilia and flagella move as a result of microtubules sliding Sliding is facilitated by motor proteins
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February 5, 2007 - February 5 2007 The Cytoskeleton The...

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