cytoskeleton and cell function

Question 1

three main filament types that together comprise the cytoskeleton

Answer 1

Intermediate filaments (IF)
Microtubules
Actin filaments

Question 2

4 subclasses of Intermediate filaments (IF)

Answer 2

1. Keratin, found in the cytoplasm of epithelial cells
2. Vimentin-related, found in the cytoplasm of connective tissue, muscle, & glial cells
3. Neurofilaments, found in the cytoplasm of nerve cells
4. Nuclear lamins, found in the nucleus of all cells

Question 3

function of cytoskeleton

Answer 3

define shape and provide strength for cell

Question 4

desmosomes

Answer 4

IF network of neighboring cells through a cellular junction termed a desmosome

Question 5

Microtubules’ polarity characteristic is important for what?

Answer 5

1. Movement of vesicles and organelles
2. Chromosome segregation
3. Movement of cilia and flagella

Question 6

dynamic instability of microtubules

Answer 6

microtubules alternately lengthen and shorten from the (+) end,

Question 7

picture of the structure of microtubule motor proteins.

Answer 7

Question 8

which sign (+) or (-) is closer to the nucleus

Answer 8

(-)

Question 9

depolymerization is required during chromosome separation

Answer 9

true

Question 10

motor protein ciliary dynein

Answer 10

result in bending motion of cilia and flagella

Question 11

actin filament

Answer 11

Actin filaments are thin, flexible polymers of individual actin molecules (termed actin monomers) that form a twisted helix. Provide structural support