The Cytoskeleton

Question 1

What type of cells is the cytoskeleton found in?

Answer 1

Eukaryotic cells

Question 2

What size are actin filaments

Answer 2

Microfilaments ~7nm

Question 3

What size are intermediate filaments?

Answer 3

~10nm

Question 4

What size are tumbling filaments?

Answer 4

Macrofilaments ~25nn

Question 5

What is the formation of actin micro filament

Answer 5

G actin = globular actin

ATP-Actin = adds to the positive end

ADP-Actin = detaches from the negative end

Question 6

What do intermediate filaments give to cells?

Answer 6

They provide tensile strength to cells

They maintain cells attached to each other and help them to resist mechanical stress

Question 7

What are the four types of intermediate filament?

Answer 7

Keratin

Vimentin

Neurofilament protein

Nuclear lamins

Question 8

Describe the structure of a tubulin filament

Answer 8

13 protofilaments wrap around each other to form a tubule

They are elongated unbranded cylindrical tubes

Each tube is formed by 13 subunits celled protofilaments