Cytoskeleton

Question 1

Role of actin inside a cell

Answer 1

Provides additional support to cell as contents of cell exert pressure on membrane
Highly dynamic and can grow or shrink cell to allow cell to respond to change by altering shape or

Question 2

What’s bigger microtubules or actin

Answer 2

Microtubules

Question 3

How does actin filament allow cell to move
How is it different to microtubule

Answer 3

Grow from + end and shrink from - end allowing cell to change shape and move

Microtubule grow and shrink from plus end

Question 4

Difference in structure between microtubules and actin

Answer 4

Microtubules are bigger more rigid and hollow in structure.

Question 5

How is a microtubule organised inside a cell

Answer 5

• end of all microtubules localise to the Microtubule Organising Centre( centrosome ) near the nucleus
  + ends point towards plasma membrane

Question 6

How does a microtubule form

Answer 6

Monomer tubulin added to + end
When microtubule fully grown it us capped to stabilise it
When. It needs to shrink cap is removed and tubulin dissociates from plus end

Question 7

Role of intermediate filaments in cytoskeleton of a cell

Answer 7

Mechanical strength and connect cells together in tissue

Form nucleur lamina (beneath the nuclear membrane)

Question 8

Role of microtubules

Answer 8

Remodel to allow cell to send organelles or vesicles to new parts of cell

Question 9

Describe movement of flagella and the role of microtubules in it

Answer 9

Multiple microtubules are arranged down the length of flagella as doublets
Doublets r cross linked w protein called nexin
Motor protein can’t move due to doublets being cross linked so energy results in flagella bending

Question 10

What is name of protein that holds cross links together in doublets of microtubules

Answer 10

Nexin