what is the difference between microtubules microfilaments and intermediate filaments?
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Microfilaments are polymers of the protein actin and are 7 nm in diameter. Microtubules are composed of tubulin and are 25 nm in diameter. Intermediate filaments are composed of various proteins, depending on the type of cell in which they are found; they are normally 8-12 nm in diameter.
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Myofibrils are composed of long proteins including actin, myosin and titin. The long proteins that hold the myofibrils together are organised into thick and thin filaments. These are called myofilaments. These repeat along the length of the myofibrils in sections called as sarcomeres.
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Many cell organelles, most notably the nucleus, are anchored by intermediate filaments which are assembled from a diverse class of proteins. 3. Centrosomes are sites where protein dimers assemble into microtubules.
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These proteins are organized into thick and thin filaments called myofilaments, which repeat along the length of the myofibril in sections called sarcomeres. Muscles contract by sliding the thick (myosin) and thin (actin) filaments along each other.
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In anaphase I, the homologous chromosomes are separated. In prometaphase II, microtubules attach to the kinetochores of sister chromatids, and the sister chromatids are arranged at the midpoint of the cells in metaphase II. In anaphase II, the sister chromatids are separated.
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Cilia are short, hair-like structure, present in large numbers in a cell, while flagella are long, hair-like complex structure and are few per cell. Cilia and flagella are hair-like appendages, extending through the surface of the living cell, they differ in their mode of beating, size, and number.
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The cytoskeleton of a cell is made up of microtubules, actin filaments, and intermediate filaments. These structures give the cell its shape and help organize the cell's parts. In addition, they provide a basis for movement and cell division.
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Thick filaments consist primarily of the protein myosin. Each thick filament is approximately 15 nm in diameter, and each is made of several hundred molecules of myosin. A myosin molecule is shaped like a golf club, with a tail formed of two intertwined chains and a double globular head projecting from it at an angle.
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Within each myofibril are filaments of the proteins myosin and actin; these filaments slide past one another as the muscle contracts and expands. On each myofibril, regularly occurring dark bands, called Z lines, can be seen where actin and myosin filaments overlap.
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Prokaryotic flagellum has two parts- Basal body, Hook, Filament. ... Prokaryotic flagella are formed of flagellin protein while Eukaryotic flagella are formed of tubulin protein. Prokaryotic flagella are smaller in size and narrower while Eukaryotic flagella are larger in size and thicker.
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Microfilaments 50–60 Å in diameter occur commonly in many elongating cells in stems and roots of twelve species of plants investigated. The microfilaments occur in bundles as cytoplasmic fibers in the peripheral regions of an elongating cell and are usually oriented parallel to the longitudinal axis of the cell.
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The cytoskeleton is a network of microfilaments, intermediate filaments, and microtubules. 2. The cytoskeleton has a variety functions including, giving shape to cells lacking a cell wall, allowing for cell movement, enabling movement of organelles within the cell, endocytosis, and cell division.
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The main difference between colonial and filamentous organisms is that colonial organisms form a mass of similar cells while filamentous organisms form an array of organisms that resemble a filament. Moreover, colonial organisms appear as a sphere while filamentous organisms appear as a thread.
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['Cytoskeleton. network of fibers extending throughout the cytoplasm and composed of microtubules, microfilaments, and intermediate filaments.', 'Function of Cytoskeleton. ... ', 'cell motility. ... ', 'motor proteins. ... ', 'Microfilaments (Actin) ... ', 'Microfilaments (Actin) Function. ... ', 'Intermediate Filaments. ... ', 'Intermediate Function.']
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Myofilaments are the filaments of myofibrils, constructed from proteins, principally myosin or actin. Types of muscle are striated muscle (such as skeletal muscle and cardiac muscle), obliquely striated muscle (found in some invertebrates), and smooth muscle.
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They are the same thing. As the others have written, microtubules are a “track” that can move organelles around when “motor” proteins (that cleave ATP) pull those organelles. The spindle is what moves the chromosomes during mitosis and meiosis. ... Spindle fibers are used in cell division, and are made of microtubules.
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There are two main types of myofilaments: thick filaments and thin filaments. Thick filaments are composed primarily of myosin proteins, the tails of which bind together leaving the heads exposed to the interlaced thin filaments. Thin filaments are composed of actin, tropomyosin, and troponin.