Cytoskeleton

Question 1

Describe microfilaments

Answer 1

7mn
Composed of two actin filaments twisted
Muscle contraction

Question 2

Describe intermediate filaments

Answer 2

8-10nm
Diverse group of proteins
Maintain position of organelles and shape of cell

Question 3

Describe microtubules

Answer 3

Hollow rods
25nm
Constructed of globular proteins Tubulins

Question 4

Why is the cytoskeleton important?

Answer 4

Its in every cell and critical to normal embryonic development

Question 5

Abnormalities in the cytoskeleton result in what?

Answer 5

Myriad of diseases affecting every tissue in the body

Question 6

Where are microfilaments found?

Answer 6

All eukaryotic cells

Question 7

What are microfilaments used for?

Answer 7

Contraction of muscles where they interact with myosin filaments

Question 8

What holds together the two lobes of the actin monomer?

Answer 8

ATP

Question 9

What does G actin assemble into?

Answer 9

Helical f actin polymers

Question 10

What do toxins such as phalloidin do to F actin?

Answer 10

Prevent disassembly- can be used to stain actin

Question 11

Where is phalloidin found?

Answer 11

Death cap mushrooms