Tubular structure enclosed by a membrane found within animal and plant cells. Of varying length, they have several functions. They help give shape to many cells and are major components of cilia and flagella, participate in the formation of the spindle during cell division (mitosis), and assist the movement of vesicles from the cell bodies of nerve cells toward the ends of those cells' long extensions (axons) and back to the cell bodies
A cytoskeletal element of eukaryotic cells that is a long, generally straight, hollow tube with an external diameter of 24 nm, consisting of polymerized monomers of tubulin Microtubules make up the bulk of the spindle
A type of filamentous protein polymer found in the cytoplasm of eukaryotic cells, composed of the protein tubulin, and occurs singly or in pairs, triplets, or bundles Microtubules help cells to maintain there shape They are part of the cytosceleton and are involved in cell movement and cell structure
Thin tubules found in the cytoplasm of a cell Microtubules are made up of tubulin subunits Microtubules function both as a cytoskeletal support and for transport within the cell Motor-molecules, associated with the microtubules, are able to ferry such things as organelles along the microtubules
Type of filament in eukaryotic cells composed of units of the protein tubulin Among other functions, it is the primary structural component of the eukaryotic flagellum
Small cylinders, about 25 nm in diameter, made of tubulin proteins and present in the cytoplasmic matrix and flagella of eucaryotic cells; they are involved in cell structure and movement (See 78)