Molecules - Starch, Glycogen and Cellulose

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What two polysaccharides are found in plant cells?
Starch and cellulose
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Glycogen is found in?
Animal cells.
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Describe the structure of starch?
Chains of alpha glucose linked together by glycosidic bonds formed by condensation reactions. Chains are unbranched and wound into coils.
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Describe the structure of glycogen?
Similar to starch but has shorter chains and is more highly branched.
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Describe the structure of cellulose?
Straight unbranched chains of B-glucose which run parallel to each other and hydrogen bonds to form cross-linkages between adjacent chains. The molecule rotates 180 to form a glycosidic link.
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Why is starch good for energy storage?
1) It is insoluble - doesn't draw water in via osmosis. 2) Doesn't easily diffuse out of cells. 3) Compact so storable in a small space. 4) Forms a glucose when hydrolysed which is transported and used in respiration
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What is the difference between starch and glycogen?
Glycogen is even more readily hydrolysed to a glucose due to the short chains.
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How does the cellulose molecule maintain its strength?
It has a sheer number of hydrogen bonds.
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What does cellulose do?
Provide rigidity and prevent the cell from bursting by exerting an inwards pressure that stops and further water influx.
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How are cellulose arranged?
Arranged in micrfibrils which are then arranged into fibres.
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Other cards in this set

Card 2

Front

Glycogen is found in?

Back

Animal cells.

Card 3

Front

Describe the structure of starch?

Back

Preview of the front of card 3

Card 4

Front

Describe the structure of glycogen?

Back

Preview of the front of card 4

Card 5

Front

Describe the structure of cellulose?

Back

Preview of the front of card 5
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