4.2.4 - Starch & Cellulose: Structure & Function

Question 1

Describe The Structure Of Cellulose
(3 Points)

Answer 1

~ Polymer consisting of long chains of beta glucose molecules, joined together by 1,4 glycosidic bonds.

~ Beta glucose is an isomer, consecutive beta glucose molecules must be rotated 180 degrees to each other to form the 1,4 glycosidic bonds.

~ Due to the inversion of the beta glucose molecules many hydrogen bonds form between the long chains, giving cellulose strength.

Question 2

Describe The Function Of Cellulose
(4 Points)

Answer 2

~ Main structural component of cell walls due to its strength, is a result of the many hydrogen bonds found between the parallel chains of microfibrils.

~ Its high tensile strength allows it to be stretched without breaking, making it possible to withstand turgor pressure.

~ Cellulose fibres and other molecules found in the cell wall form a matrix, increasing the strength of the cell walls.

~ Providing support to plants.