examples fats – butter, lard (solid @ room temp) oils - liquid @ room temp waxes hormones
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Regents Biology 2003-2004
Examples fats – butter, lard (solid @ room temp)Oils - liquid @ room tempwaxeshormones
sex hormonestestosterone (male)
estrogen (female)
LIPIDS: Concentrated energy molecules
Regents Biology 2003-2004
Lipids
Function:1.energy storage
very concentrated twice the energy as carbohydrates! (higher in calories)
2.cell membrane
3.cushions organs
4. insulates body think whale blubber!
Regents Biology 2003-2004
Structure of Fat
not a chain (polymer) = just a “big fat molecule”
glycerol
fattyacids(3)
Regents Biology 2003-2004
Saturated fats
Most animal fats solid at room
temperature
Limit the amount in your diet contributes to heart
disease deposits in arteries Straight molecule
ALL single C-C bonds
Regents Biology 2003-2004
Unsaturated fats
Plant, vegetable & fish fats liquid at room temp
the fat molecules don’t
stack tightly together
Better choice in your diet
Molecule is bentDouble and/or triple C=C bond(s) present
Regents Biology 2003-2004
Other lipids in biology
Cholesterol good molecule in cell
membranes “glue”; helps to stabilize
membrane make hormones from it
including sex hormones but too much
cholesterol in blood may lead to heart disease
plaque
Regents Biology 2003-2004
Other lipids in biology Cell membranes are made out of lipids
phospholipids heads are on the outside touching water
“like” water tails – (2) are on inside away from water
“scared” of water (oil and water don’t mix) forms a barrier
between the cell & the outside
outside
inside
bilayer
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