cellulose (structural to function)

Question 1

large molecule consisting of thousands of beta glucose residues linked by beta (1-4) glycosidic bonds with 180 deg rotation of alternate glucose residues

Answer 1

• long straight chains of cellulose
• many organisms do not have the enzymes to break down the beta (1-4) glycosidc bonds, providing fibres for peristalsis of intestines
• for organisms that can digest it, cellulose is a source of energy

Question 2

-OH groups projecting outward of cellulose chains

Answer 2

allow extensive interchain H-bond to be formed between numerous cellulose chains, hence increasing tensile strength
- lack of free -OH groups in this large molecule to H bond with water hence insoluble

Question 3

chains associated in groups to form microfibrils and macrofibrills

Answer 3

• further increase tensile strength and mechanical strength

Question 4

spaces between the macrofibrils

Answer 4

• fully permeable hence cell wall does not restrict movement of substance in and out of the cell