Lec 20

Question 1

Intermediate filament

Answer 1

Larger than actin but smaller than microtubules

Question 2

Intermediate filament structure

Answer 2

Polypeptides come together to make a subunit protein that is a fibrous homodimer

Subunits come together to make intermediate filaments

No + or - end

Question 3

Assembly and disassembly of intermediate filaments

Answer 3

They are semi-permanent (all or none)

Either subunits or a full intermediate filament

Question 4

Stability for intermediate filaments is

Answer 4

Desirable

Question 5

Stability is given by

Answer 5

Cytoskeleton

Nuclear lamina

Formation of extracellular structures

Question 6

Cytoskeleton

Answer 6

Intermediate filament made with cytokeratin proteins

Question 7

Nuclear lamina

Answer 7

IFs made with nuclear Lamin proteins that line the inside of the nuclear envelope

Question 8

Formation of extracellular structures

Answer 8

IFs made with Extracellular keratin proteins from hair, nails etc.