Cell wall and cellulose
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What is the cell wall made up of?
What is cellulose made up of?
Long unbranched chain of b glucose linked together by 1,4 glycosidic bonds
How are hydrogen bond/cross links made in cellulose? (5 marks)
In cellulose, every other b glucose molecule is inverted 180 degrees
this means a hydroxyl group sticks out on both sides of the molecule
Hydrogen bonds can form between the positively charged hydrogen from the hydroxyl group and negatively charged oxygen atom from the glycosidic bond
Results in neighbouring chain being help close together
Known as cross linking
Why is cellulose good for structural protein
Hydrogen bonds stop cellulose being hydrolysed by enzymes
What layer compose the cell wall
- Middle lamella
Describe the structure and fuction of the middle lamella? (3 marks)
- Made out of a polysaccharide called pectin which is negativity charged
- Bind to positively charged calcium to form calcium pectate
- Binds to the cellulose of neighbouring cells
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