Cell cycle (cytokinesis) Flashcards
final stage in the cell cycle
cytokinesis
division of the cytoplasm in two.
cytokinesis
some cells undergo ____without cytokinesis and thereby acquire multiple nuclei.
mitosis
The first visible change of cytokinesis in an animal cell
appearance of a pucker, or cleavage furrow
The structure underlying furrow process
contractile ring
As the sister chromatids separate in anaphase, ____ and _____ II begin to
accumulate in the rapidly assembling
contractile ring
actin and myosin II
depends on formin (parallel arrays of
linear, unbranched actin filaments)
local formation of actin filaments
overlapping arrays of actin and myosin II
filaments ___ to generate the force
that divides the cytoplasm in two
contract
persists as a tether between
the two daughter cells and contains the
remains of the central spindle
midbody
a large protein structure derived from
the antiparallel interpolar microtubules
of the spindle midzone, packed tightly
together within a dense matrix material
central spindle
small GTPase of the Ras superfamily
RhoA
controls the assembly and function of the
contractile ring at the site of cleavage
RhoA
RhoA promotes:
actin filament formation, myosin II
assembly, and ring contraction at the cell
cortex
RhoA stimulates actin filament formation by
activating formins; activating multiple protein
kinase (Rock)
must occur only after the two sets of
chromosomes are fully segregated from each other
Cytokinesis
must be placed
between the two sets of daughter
chromosomes
site of division