Cell biology VI Flashcards
What is the role of microtubule-associated proteins?
Stabilize microtubules
What is the diameter of a microfilament?
6-8 nm
What are the subunits of microfilaments?
Actin
Actin subunits make up what cytoskeletal component?
Microfilaments
What drug inhibits polymerization of actin?
Cytocalasin B
What is the function of Cytocalasin B?
Prevents polymerization of actin subunits
What are the functions of microfilaments?
1) Structural support2) Form core of microvilli and stereocilia3) Cell movement4) Cytokinesis5) Formation of filopodia and lamellipodia
What is the diameter of thick filaments?
12-16 nm
What are the subunits of thick filaments?
Myosin
Myosin makes up which cytoskeletal component?
Thick filaments
What is the diameter of intermediate filaments?
About 10 nm
Cytokeratins are what kind of cytoskeletal component?
Intermediate filament
Desmin is what kind of cytoskeletal component?
Intermediate filament
Where are cytokeratins localized?
Epithelial cells
Where is desmin localized?
Muscle (smooth and striated)
Glial fibrillary acidic proteins (GFAPs) are what kind of cytoskeletal component?
Intermediate filament
Where are glial fibrillary acidic proteins (GFAPs) localized?
Astrocytic glial cells
Neurofilament proteins are what kind of cytoskeletal component?
Intermediate filament
Where are neurofilaments localized?
Neurons
Nuclear lamins are what kind of cytoskeletal component?
Intermediate filament
Where are nuclear lamins localized?
Nucleus of all cells
Vimentin is what kind of cytoskeletal component?
Intermediate filament