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Title: AQA AS BIOLOGY STARCH, GLYCOGEN AND CELLULOSE
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
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Starch is NEVER found in
animal cells
...
Found in
many parts of plants (chloroplasts)
...
Main role is energy store, it’s
suitable because:
Made up of chains of a-glucose monosaccharides linked by glycosidic bonds formed by
condensation reactions
...
It’s insoluble
Amylopectin: branched chains with 1-6 glycosidic bonds between a-glucose molecules
...
These run parallel to each other
= allows hydrogen bonds to form crosslinkages between adjacent chains
...
Cellulose is made up of b-glucose molecules
...
Glycogen is found in animal and
bacteria cells, NEVER in plants
...
Major carbohydrate storage product of animals
...
Major component in plant cell walls / prevents cell from busting as water enters
by osmosis = it exerts an inward pressure, stopping the influx of water
...
Compact
More rapidly broken down than starch
The sheer number of hydrogen bonds contributes to its
strength
Title: AQA AS BIOLOGY STARCH, GLYCOGEN AND CELLULOSE
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.
Description: Detailed first year (AS) biology notes to aid key revision of topics and enhance knowledge.