Glossary of Chapter 17 Cell Biology

Start Studying! Add Cards ↓

actin filament
protein filament about 7 nm wide formed from a chain of globular acim molecules. A mjor costituent of cytoskeleton. Abundant in muscle cells
cell cortex
specialized layer of cytoplasm on the inner face of the plasma membrane. In animal cells it is an actin rich layer responsible for cell surface movements
short cylindrical array of microtubules, usually found in pairs at the center of centrosomes in animal cells. Also found at the base of cilia and flagella.
centrally located organelle of animal cells that is the primary microtubule organizing center and acts as the spindle pole during mitosis. In most animal cells it contains a pair of centrioles.
hairlike extension on the surface of a cell with a core bundles of mt and capable of performing repeated beating movmt of fluid over epithelial cells
system of protein filaments in the cytoplasm of a cell that gives the cell shape and the capacity for directed mvmt.
dynamic instability
the property shown by mt of growing and shrinking repeatedly through the addition oand loss of tubulin subunits from their exposed ends.
member of a family of large motor proteins that undergo ATP dependent movement along microtubules. Dynein is responsible for the bending of cilia.
long thin actin containing extension on teh surface of an animal cell. sometimes has an exploratory function, as in a growth cone.
long, whiplike protrusion tha tdrives a cell through a fluid medium by its beating. Eucaryotic flagella are longer versions of cilia; bacteria are different and simpler.
intermediate filament
fibrous protein filament that forms ropelike networks in animal cells often used as a structural element that resists tension applied to teh cell from outside.
one member of a large family of motor protein that uses the entergy of ATP hydrolysis to move along a microtubule.
dynamic sheetlike extension on the surface of an animal cell, especially one migrating over a surface.
long, stiff cylindrical structure, composed of the protein tubulin. Used by eucaryotic cells to regulate their shape and control their mvmt.
motor protein
protein such as myosin or kinesin that uses energy derived from ATP hydrolysis to propel itself along a protein filament or polymeric molecule.
type of motor protein that uses ATP to drive movements along actin. Forms the thick filaments of skeletal muscle. responsible for many actin based movements.
nuclear lamina
fibrous layer on the inner surface of the inner nuclar membrane made up of a network of intermediate filaments made from nuclear lamins.
refers to a structure such as an actin filament or a fertilized egg that hasa n inherent direction so that one can distinguish one end from the other.
Rho protein family
Family of monomeric GTPases involved in signaling the rearangement of the actin cytoskeleton
repeating unit of a myofibril in a muscle cell, about 2.5 micrometer long composed of an array of overlapping thick and thin filaments.
protein from which microtubules are made.

Add Cards

You must Login or Register to add cards