Transcript Lipids: Fats & Oils - Hutchinson Science

Lipids
2003-2004
Lipids
 Examples

fats

oils

waxes

hormones
 steroids
 sex hormones
 testosterone (male)
 estrogen (female)
2003-2004
Lipids
 Function:

energy storage
 Supplies more energy than carbohydrates:
 1 g. fat = 9cal
 1 g. carb = 4 cal
structure of cell membrane
 sex hormones
 cushions organs
 insulates body

 think whale blubber!
2003-2004
Structure of Fat
not a chain (polymer) = just a “big fat molecule”
2003-2004
Fats: Produced by dehydration synthesis
* Fats are made with 1 Glycerol molecule
and 3 Fatty Acid molecules
 Glycerol and fatty acids contain…
CARBON, HYDROGEN, and OXYGEN
5
FATScan be classified as saturated or unsaturated
6
Saturated fats
 Most animal fatsbutter, meat fat

solid at room
temperature
 Limit the amount
in your diet
contributes to
heart disease
 deposits in
arteries

2003-2004
Unsaturated fats
 Plant, vegetable, nuts &
cold water fish fats (oils)

liquid at room
temperature
 Better choice in your
diet
2003-2004
Saturated vs. unsaturated
saturated
unsaturated
2003-2004
Other lipids in biology
 Cholesterol
good molecule in cell membranes
 make hormones from it

 including sex hormones

but too much cholesterol in blood may
lead to heart disease
2003-2004
Other lipids in biology
 Cell membranes are made out of lipids
phospholipids
 heads are on the outside touching water

 “like” water

tails are on inside away from water
 “scared” of water

forms a barrier
between the cell
& the outside
2003-2004