C14 Cytoskeleton

Question 1

actin filaments

Answer 1

small-diameter cytoskeletal fibers made of subunits of the protein actin

Question 2

intermediate filaments

Answer 2

cytokeletal fibers whose size is intermediate between those of actin filaments and microtubules and can be made from a variety of protein subunits

Question 3

microtubules

Answer 3

large-diameter, hollow cytoskeletal elements made of pairs of the proteins a-tubulin and B-tubulin
- 2 dimers that join to make it

Question 4

what are the 3 components of cytoskeletons?

Answer 4

microfilaments, intermediate filaments, and microtubules

Question 5

microfilaments

Answer 5

• actin, made of actin subunits, come together to make actin filaments
• smallest diameter
• involved in cell movement
• can help stabilize shape
• can depolarize (break down) or polymerize (build up) quickly to allow it to move

Question 6

what is microfilaments action called?

Answer 6

amoeboid movement (so depol. and pol.)
and cytoplasmic streaming

Question 7

cells have the highest concentration of actin during

Answer 7

mitosis and cytokinesis

Question 8

______ polymerize microtubules during mitosis and meisosis

Answer 8

centrosomes

Question 9

say their subunit(s) and major functions: microfilaments

Answer 9

actin monomers
- cell shape and support
- cell movement (by crawling)
- cell division (cytokinesis)
- vesicle transport
- muscle contraction

Question 10

say their subunit(s) and major functions: intermediate filaments

Answer 10

diverse
- cell shape and support

Question 11

say their subunit(s) and major functions: microtubules

Answer 11

tubulin dimers
- cell shape and support
- cell movement (by cilia, flagella)
- cell division (chromosome segregation)
- vesicle transport
- organelle arrangement