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Summary AQA A Level Biology Polysaccharides notes £7.16   Add to cart
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Summary AQA A Level Biology Polysaccharides notes
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Notes on Polysaccharides sub-topic within AQA A Level Biology Unit 1- Biological Molecules. These notes contain sub headings with different methods of note taking like tables, images from online videos and concise bullet points.

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  • September 7, 2024
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  • 2024/2025
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Polysaccharides

Introducing Polysaccharides:
Polysaccharides are carbohydrate polymers made up of many
monosaccharides.
True polysaccharides have more than 10 monosaccharides joined together-
smaller chains are called oligosaccharides.
Polysaccharides are formed by joining together monosaccharides in a series of
condensation reactions.
Polysaccharides are broken down in a series of hydrolysis reactions to form
monosaccharides- this can happen in 2 ways:

Hydrolysis and hydrolsis

Snapped in half

Polysaccharides can be formed by:

Chaning the type of monosaccharide

Changing how the monosaccharides are bonded together

Polysaccharides are used as energy sources- alpha glucose is the main source
of energy in respiration
Excess chemical energy is stored in cells by forming polysaccharides of alpha
glucose.
Alpha glucose polysaccharies are well-suited to energy storage for a number of
reasons:

They are compact so a lot of energy can be stored

They are insoluble in water- don’t impact the water potential of a cell

They are large so they don’t diffuse out of the cell

They can be easily hydrolysed to alpha glucose when energy is needed




Polysaccharides 1

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