Question

of the three types of fibers; microfilaments (or and intermediate filaments are fibers with diameters in a Microtubules are the filaments) are the middle range. Microtubules are hollow rods about 25 nm in diameter and 200 nm to 25 um in length. Microtubule fibers are constructed of the globular protein A tubulin dimer consists of two slightly different polypeptides: a-tubulin and B-tubulin. Microtubules shape and support the cell and serve as tracks to guide motor proteins carrving organelles to their destination. Microtubules guide membrane. Microtubules are also responsible for the division In many animal cells, microtubules grow out from a These microtubules resist compression to the cell. Although centrosomes with centrioles acts as they are not essential for this function. Fungi and most plant cells lack centrosomes with centrioles but have well-organized microtubules A specialized arrangement of microtubules is responsible for the beating of cilia and flagella. Many unicellular eukaryotic organisms are propelled through water by cilia and flagella. The sperm of animals, algae, and some plants have flagella. Cilia and flagella differ in their beating patterns. A flagellum has an undulatory movement that generates force in the same direction as the flagellum's axis, like the tail of a fish. Cilia move more like oars, with alternating power and recovery strokes that generate force perpendicular to the cilium's axis. from the Golgi apparatus to the plasma of chromosomes during cell the nucleus. near O in animal cells, C O motor proteins are responsible for the bending movements of the O organelle, as they perform a complex cycle of movements caused by changes in the shape of the protein. These changes in shape are powered by ATP. Microfilaments or solid rods about 7 nm in diameter, present in all filaments are eukaryotic cells. Each microfilament is built as a twisted double chain of actin subunits. Cortical microfilaments form a three-dimensional network just inside the plasma membrane to help support the cell's shape, giving the cell cortex the semisolid consistency of a gel. In animal cells specialized for transporting materials across the plasma membrane, such as intestinal cells, bundles of microfilaments make up the core of microvilli. Microfilaments are important in cell motility, especially as part of the contractile apparatus of muscle cells. In muscle cells, thousands of actin filaments are arranged parallel to one another. Thicker filaments composed of myosin interdigitate with the thinner actin fibers. Like dynein with microtubules, actin filaments to shorten the cell. In other cells, actin-myosin aggregates are less organized but still cause localized contraction. C acts as a motor protein, walking along the

Answer 1

Microtubules are one of the three types of fibers;
Microfilaments (or actin filaments) are the thin fibers.
and intermediate filaments are fibers with diameters in a middle range.

Microtubules are constructed of the globular protein tubulin.

Microtubules guide proteins from the Golgi apparatus to the plasma membrane

Microtubules are also responsible for the movement of chromosomes during cell division.

In many animal cells, microtubules grow out from centrosome a near the nucleus.

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