Zusammenfassung der Ressource
STARCH (CGP pg.10 &168)
- STARCH-Main energy storage material in plants
- Cells get energy from glucose
- Plants store excesss
glucose as starch (When a
plant needs more glucose
for energy it breaks down
startch to release the
glucose)
- Insoluble in water, so water
doesn't enter the cells
through osmosis (it would
make them swell) - good for
storage
- Polysaccharide
- Starch is a mixture of two
polysaccharides of alpha-glucose
(Amylose & Amylopectin)
- AMYLOSE
- Long, unbranched chain
of alpha-glucose
- Angles of the
glycosidic bond gives it
a coiled structure
- Makes it compact; good for storage
as you can fit more things in small
spaces
- Held together by 1-4 glycosidic bonds
- AMYLOPECTIN
- 1-6 glycosidic bonds
(cause branching)
- Long, branched
chain of
alpha-glucose
- Side branches allow the
enzymes that break down the
molecule to get at the
glycosidic bonds easily
- Means that glucose can released quickly