filaments

Question 1

three dynamic filament systems

Answer 1

microfilaments, intermediate filaments and microtubules

Question 2

some examples of things that cells can do bc they have a dynamic cytoskeleton

Answer 2

crawl, move vesicles, cytokinesis, swim, assemble junctional complexes

Question 3

function of microfilaments

Answer 3

structural, mechanical, support myosin-based contractility and motility

Question 4

function of microtubules

Answer 4

long distance transport, mitotic spindle, signaling

Question 5

function of intermediate filaments

Answer 5

structural, mechaanical

Question 6

component of microfilaments

Answer 6

actin

Question 7

component of microtubules

Answer 7

a/b tubulin dimers, g/b dimers

Question 8

components of intermediate filaments

Answer 8

lamins, keratins, neurofilament proteins

Question 9

structure of microfilaments

Answer 9

two start right-handed helix, polar

Question 10

structure of microtubules

Answer 10

11-15 protofilaments form hollow tube, polar

Question 11

structure of intermediate filaments

Answer 11

coiled-coil dimer assemble into flexbile, non polar polymers

Question 12

energy source of each type of primary filament system

Answer 12

ATP for microfilaments, GTP for microtubutles, none for intermediate filaments

Question 13

how does actin affect cell locomotion

Answer 13

actin polymerization drives locomotion of the cell by assembling with the barded, fast growing end, near the plasma membrane at the front end of the cell, helping push membrane fwd

Question 14

where is actin found

Answer 14

throughout the cells cytoplasm and in a thick cortex just underneath the plasma membrane

Question 15

dynamic instability

Answer 15

characteristic behavior of microtubules, where the ends of microtubules switch between fast growing and faster shrinkage called catastrophe. Driven by nucleotide state of tubulin dimers near the ends