cytoskeleton - ANSWERSis a network of fibers extending throughout the cytoplasm
what does the cytoskeleton do? - ANSWERSorganizes the cell's structures and activities, anchoring many organelles
what three molecular structures compose cytoskeleton? - ANSWERSmicrotubules, microfilaments, interm...
BIO 1305 Dr. Lee Exam Two Questions &
Answers
cytoskeleton - ANSWERSis a network of fibers extending throughout the cytoplasm
what does the cytoskeleton do? - ANSWERSorganizes the cell's structures and
activities, anchoring many organelles
what three molecular structures compose cytoskeleton? - ANSWERSmicrotubules,
microfilaments, intermediate filaments
what are the roles of the cytoskeleton? - ANSWERSsupport, motility, regulation
what does the cytoskeleton help the cell do? - ANSWERSsupport the cell and maintain
its shape
what does the cytoskeleton interact with to produce motility? - ANSWERSmotor proteins
inside the cell, vesicles can travel along __________ provided by the cytoskeleton -
ANSWERSmonorails
what does recent evidence about the cytoskeleton suggest? - ANSWERScytoskeleton
helps regulate biochemical activities
*IMPORTANT* microfilaments and microtubules are polar - provide directions -
ANSWERSmicrofilaments and microtubules are polar - provide directions
describe microtubules - ANSWERS-the thickest of the three components of the
cytoskeleton
-hollow rods about 25 nm in diameter and about 200 nm to 25 microns long
describe microfilaments - ANSWERS-also called actin filaments, are the thinnest
components
-solid rods about 7 nm in diameter, built as a twisted double chain of actin subunits
-they form a 3-D network called the cortex just inside the plasma membrane to help
support the cell's shape
-bundles of microfilaments make up the core of microvilli of intestinal cells
describe intermediate filaments - ANSWERS-fibers with diameters in a middle range
, -range in diameter from 8-12 nanometers, larger than microfilaments but smaller than
microtubules
what are the functions of microtubules? - ANSWERS-shaping the cell
-guiding movement of organelles
-separating chromosomes during cell division
figure 6.32 slide 94 - ANSWERS
in many cells, microtubules grow out from a ___________ near the nucleus -
ANSWERScentrosome
the centrosome is a ____________ - ANSWERSthe microtubule organizing center for
the mitotic spindle.
true or false: in animal cells, the centrosome has a pair of centrioles, each with nine
triplets of microtubules arranged in a ring - ANSWERStrue
what is the structural role of microfilaments? - ANSWERSbear tension, resisting pulling
forces within the cell
microfilaments that function in cellular motility contain the protein: - ANSWERSmyosin
in addition to actin
how are actin filaments arranged in muscle cells? - ANSWERSparallel to one another
true or false: thicker filaments composed of myosin interdigitate with the thinner actin
fibers - ANSWERStrue
what drives amoeboid movement? - ANSWERSlocalized contraction brought about by
actin and myosin
what extend and contract through the reversible assembly and contraction of actin
subunits into microfilaments? - ANSWERSpseudopodia
what is cytoplasmic streaming? - ANSWERScircular flow of cytoplasm within cells
what does cytoplasmic streaming do within a cell? - ANSWERSspeeds up the
distribution of materials
what drives cytoplasmic streaming in plant cells? - ANSWERSactin-myosin interactions
and sol-gel transformations
most cells synthesize and secrete materials that are - ANSWERSexternal to the plasma
membrane
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