Cell Biology

Question 1

microfilaments

Answer 1

composed of actin, very small, G actin monomers in equilibrium with F actin polymers
Functions: sol-gel conversion of cytoplasm; microvillar shape and contraction; structural reinforcement by stress fibers

Question 2

intermediate filaments

Answer 2

function in structural support and resistance to mechanical stress
composed of spectrin and keratins

Question 3

microtubules

Answer 3

long cylinders of tubulin that radiate from the centrioles; important for cell movement and as conduits for vesicle transport;

Question 4

MTOC microtubul organizing center

Answer 4

usually the centrosome; each centrosome has two centrioles which are made up of 9 microtubule triplets; centrioles replicate prior to mitosis and make up the mitotic spindle