cytoskeleton

Question 1

True or False: Microtubules serve as tracks for kinesin
and dynein in vesicular transport.

Question 2

Q: what are the diameters of the different types of cytoskeletal filaments?

Answer 2

25nm for microtubules
10nm for intermediate filaments
6-8 for microfilaments

Question 3

if you make a cross-section across an intermediate filament, how many
monomers would you typically see in that section?

Answer 3

32

Question 4

True or False: IFs are made up of fibrous proteins that assemble into rope-like fibers.
This structure allows them to withstand stretching forces without breaking

Answer 4

true

Question 5

Which of the following statements is FALSE regarding the structure and function of
intermediate filaments?
A. Intermediate filaments can connect cells at cell–cell junctions called desmosomes.
B. Intermediate filaments protect cells from mechanical stress because they have high
tensile strength and resist stretching.
C. Intermediate filaments are constructed of identical subunits found in all eukaryotic
cells.
D. Each filament is made of eight strands, and each strand is made from staggered
tetramers linked end to end.

Answer 5

C. Intermediate filaments are constructed of identical subunits found in all eukaryotic
cells.

Question 6

Q: what is microtubule
organizing center?

Answer 6

a centrosome which consists of a pair of centrioles surrounded by a pericentriolar material