Biological Molecules: Structure and function of cellulose.

Question 1

What is the major role of cellulose?

Answer 1

= constructs the cell wall.

Question 2

What is the structure of cellulose?

Answer 2

= polysaccharide made from beta glucose
= every second glucose molecule is flipped- alternative pattern forming straight lines.
= glycocidic 1-4 bond.
= hydrogen bonds between the chains

Question 3

Is cellulose unbranched?

Answer 3

Yes.

Question 4

Why is cellulose strong?

Answer 4

= great number of hydrogen bonds.

Question 5

What is microfibril?

Answer 5

= When cellulose chains group together.

Question 6

What is macrofibrils?

Answer 6

= when microfibrils group together
= large structure

Question 7

What does macrofibrils group together to form?

Answer 7

= cellulose fibres. (form planet cell wall(.

Question 8

How does the structure of the cell wall allow it to adapt to it’s function?

Answer 8

= strength
= permeable to molecules e.g: water
= the plant cell contents push outwards agaisnt the cell wall
= strength of the wall resists the outwards pressure and prevents from bursting.

Question 9

When a plant cell is full of water what is this called?

Answer 9

= becomes rigid
= plant cell is turgid.
= help give the plant it’s upright structure.