Cytoskeleton

Question 1

What is the cytoskeleton?

Answer 1

A network of fibres and filaments that extend throughout the entire cytosol in the cell.

Question 2

What are its primary functions?

Answer 2

• Structural support

- Cell & organelle movement

Question 3

What acts like a stem for the cell?

Answer 3

Microtubule

Question 4

What are the three types of filament in cells?

Answer 4

Microtubule
Microfilament
Intermediate filament

Question 5

Which two filaments have polarity?

Answer 5

Microtubule/filaments

Question 6

Which end is fast growing?

Answer 6

Positive charged side

Question 7

Why are the filaments known to be dynamic?

Answer 7

Able to grow and shrink to adapt to the cell shape.

Question 8

Which molecule allows the filaments to grow and shrink?

Answer 8

GTP - Guanosine Triphosphate

Question 9

Function of microtubules?

Answer 9

Shape and polarity, aids in vesicle transport

Question 10

Where do microtubules grow from?

Answer 10

Centrosomes

Question 11

What is the most abundant protein in eukaryotic cells?

Answer 11

Actin

Question 12

What are microfilaments made out of?

Answer 12

Actin

Question 13

What are microtubules made out of?

Answer 13

Tubulin

Question 14

Do intermediate filaments (IFs) grow at both sides?

Answer 14

True

Question 15

Are IFs tissue specific?

Answer 15

Yes, there are six classes.

Question 16

Which molecule are IFs dependent on for growing?

Answer 16

ATP

Question 17

Are IFs only made up of one type of protein?

Answer 17

No, they can be made up of different proteins that are needed for each specific tissue type.

Question 18

Which classes do epithelial cells require?

Answer 18

Class 1 and 2 (Keratin) acidic and basic

Question 19

Which class do all cells have?

Answer 19

Class 5 - Lamin

Question 20

What causes pseudopodia to extend the cytoskeleton of amoeba?

Answer 20

Actin polymerisation