Molecules - Starch, Glycogen and Cellulose

?
What two polysaccharides are found in plant cells?
Starch and cellulose
1 of 10
Glycogen is found in?
Animal cells.
2 of 10
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.
3 of 10
Describe the structure of glycogen?
Similar to starch but has shorter chains and is more highly branched.
4 of 10
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.
5 of 10
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
6 of 10
What is the difference between starch and glycogen?
Glycogen is even more readily hydrolysed to a glucose due to the short chains.
7 of 10
How does the cellulose molecule maintain its strength?
It has a sheer number of hydrogen bonds.
8 of 10
What does cellulose do?
Provide rigidity and prevent the cell from bursting by exerting an inwards pressure that stops and further water influx.
9 of 10
How are cellulose arranged?
Arranged in micrfibrils which are then arranged into fibres.
10 of 10

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
View more cards

Comments

No comments have yet been made

Similar Biology resources:

See all Biology resources »See all Cellular processes and structure resources »