A-Level Biology OCR A
Bonds Hydrogen Glucose Strength Form Cellulose Wrt Bonding
| Front |
Relate structural properties to the functions of cellulose wrt solubility, size, bonding and presence of side chains. |
| Back |
Solubility & Size- Insoluble - does not dissolve away - forms good barrier between cytoplasm and exterior
- Too large of a molecule, overcomes water's hydrogen bonds attempting to separate the molecules (~10000 glucose molecules in a chain)
- Length of chain gives it good tensile strength - supports cells, preventing them from bursting allowing cells to become turgid which gives plant tissue support and strength
Bonding & Side chains - Composed of beta glucose molecules, each consecutive one is flipped forming beta 1,4 glycosidic bonds
- Because each consecutive glucose is flipped wrt previous one there is no helical structure or intramolecular hydrogen bonds between different -OH groups - linear chains
- Each chain is parallel to each other - form intermolecular hydrogen bonds - 80 of them form microfibrils which form macrofibrils - additional strength
- Cellulose fibrils run in different directions - give cell wall extra support
- Water can fill space between fibrils - fully permeable allowing for ions/molecules to enter cell
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A-Level Biology OCR A