Microtubules
These straight, hollow cylinders are found throughout the cytoplasm of all eukaryotic cells (prokaryotes don't have them) and carry out a variety of functions, ranging from transport to structural support.
Chapter 1
The role of microtubules in transport between the endoplasmic reticulum and Golgi apparatus in mammalian cells
Krysten J. Palmer, Peter Watson and David J. Stephens1 ...
Microtubules - Thick Protein Tubes
Microtubules are usually discussed with microfilaments. Although they are both proteins that help define cell structure and movement, they are very different molecules.
Microtubules are one of the components of the cytoskeleton. They have diameter of ~ 24 nm and length varying from several micrometers to possibly millimeters in axons of nerve cells.
Microtubules
Microtubules
are straight, hollow cylinders whose wall is made up of a ring of 13 "protofilaments";
have a diameter of about 25 nm;
are variable in length but can grow 1000 times as long as they are wide; ...
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.
microtubules Filaments about 25 nanometers in diameter found in cilia, þagella, and the cytoskeleton. PICTURE ...
Microtubules part of the cytoskeleton consisting of hollow tubes made of globular proteins
(micro = small)
Stanley Miller person who‚ in 1953‚ tested Oparin's hypothesis on the abiotic synthesis of organic monomers on early Earth ...
Microtubules, microfilaments & intermediate filaments
The Cytoskeleton ...
Microtubules lengthen and shorten by the addition or removal of tubulin dimers. Click here for details in the chapter on cells.
Kinetochore microtubules shorten in the region of the kinetochore, pulling the chromosomes apart.
Microtubules are small hollow cylinders (25 nm in diameter and from 200 nm-25 µm in length). These microtubules are composed of a globular protein tubulin.
- microtubules
- actin filaments (microfilaments)
- intermediate fibers
Some Keywords...
A collection of microtubules attached to a centromere during mitosis and meiosis that are responsible for the movement of the chromosomes to opposite poles.
An assemblage of microtubules that orchestrates chromosome movement during eukaryotic cell division.
spiracle
[L. spirare, to breathe]
One of the external openings of the respiratory system in terrestrial arthropods.
Cytoskeleton - network of microtubules that support and give structure to cell while aiding in intracellular transport
Cytosol - jelly-like material that contains the organelles between the nucleus and the plasma membrane ...
The cytoskeleton of the cell has three components: microtubules, microfilaments, and intermediate filaments. Microtubules look something like a straw. The tubulin protein subunits of microtubules associate in a cylindrical arrangement.
Tubulin is the protein which makes up microtubules. Microtubules are assembled from dimers of α- and β-tubulin. Each of these subunits has three domains.
Microtubules create a spindle, and that's really the structural elements of the cell that coordinate the cells moving away from each other. And the centrosomes organize the microtubules, so it's called the microtubules organizing center.
During mitosis, chromosome separation requires spindle fibers made of microtubules; spindle inhibitors stop the synthesis of microtubules. Because most adult cells don't divide often, they are less sensitive to these drugs than are cancer cells.
Structure forming at centromere during mitosis for binding microtubules.
Related Terms:
Centromere ...
Dynamic instability A property of microtubules such that some microtubules in a population lengthen while other simultaneously shorten; ...
During cell division, microtubules form the spindle that directs chromosomes to the daughter cells. Microtubules also serve as tracks for transporting vesicles and give structure to flagella and cilia.
Spindle The structure of microtubules which pulls the chromosomes into the daughter cells at anaphase in cell division.
Splice acceptor site The junction between the 3´ end of an intron and the following exon.
axoneme - the motor section of the flagellum which is a construction of microtubules emanating from the centriole at the base of the flagellum.
Bilateria - group containing all multicellular animals with bilateral symmetry.
apical complex Dense ring and conelike structure, along with associated microtubules, micronemes, and rhoptries, at the anterior end of an apicomplexan sporozoite.
cytoplasmic filaments intermediate in diameter (about 10 nanometers) between the microfilaments and the microtubules. They may be composed of any of a number of different proteins and form a ring around the cell nucleus.
centriole
One of two structures in the center of animal cells, composed of cylinders of nine triplet microtubules in a ring. Centrioles help organize microtubule assembly during cell division.
Covered in BIOL1020 Lab 6 Mitosis & Meiosis ...
Kinetochore
Structure forming at centromere during mitosis for binding microtubules.
a microtubule-dependent motor protein; cytoplasmic dyneins work in organelle transport and mitosis, whereas the closely related ciliary dyneins are attatched to outer doublet microtubules in a cilium or flagellum, ...
 See also: Microtubule, Cell, Cells, Protein, Organ
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