cytoskeleton Flashcards
what is cytoskeleton and where is it found
it is a proteinaceous filament, present in the cytoplasm of cell
only found in eukaryotes
what is cytoskeleton and where is it found
it is a proteinaceous filament, present in the cytoplasm of cell
only found in eukaryotes
what is the function of cytoskeleton?
structure, motility, mechanical support, shape and cilia, flagella formation
what is the cytoskeleton made up of
microtubule, microfilament, and intermediate filament
state details of the structure of the microtubule
it is an unbranched hollow kind of structure, with a 15um core and a diameter of 25um
has 13 protofilaments, each has alpha-beta subunits
composed of tubulin protein (non-contractile)
the assembly and dissemble depends on Ca2+ and GTP
FUNCTIONS OF MICROTUBULES
helps in the spindle and astral rays during cell division and also in anaphase
it helps in protein transport in cells and inorganic ions
it gives rigidity structure and motility to a cell
position of future cell plate is decided by them
it helps to form cilia and flagella
structure of microfilaments
it is a solid, rod-like, indefinite-length, unbranched structure forms extensive network and is associated with pm
it is made up of actin and mysosin
functions of the microfilaments
it supports pm
forms the furrow during cell division
helps amoeba in movements, forms pseudopodia
it has a contractile system
cytoplasmic streaming
give some info about the intermediate filaments
it is a non contractile filament
made of acidic proteins
makes scaffolds of chromatin and basket of nucleus
is the cytoskeleton found in prokaryotes?
no only in eukaryotes
what is the length of the core and diameter of microtubules
15um and 25um respectively
assembly and disassembly of the alpha and beta subunits depend on what?
the Ca2+ and GTP
how many protofilaments are present in the boundary
13
what is microfilaments composed up of
actin and myosin
what is an intermediate protein made up of
acidic protein
