Lesson 7d: Lipids (Fats & Oils) Regents Biology Lipids Concentrated energy molecules.
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Transcript of Lesson 7d: Lipids (Fats & Oils) Regents Biology Lipids Concentrated energy molecules.
Lesson 7d: Lipids (Fats & Oils)
Regents Biology
LipidsConcentrated energy molecules
Lipids Examples
fatsoilswaxeshormones
sex hormonestestosterone (male)
estrogen (female)
Lipids
Function: energy storage
very concentrated twice the energy as carbohydrates!
cell membrane cushions organs insulates body
think whale blubber!
Molecular Structure of Fat
not a chain (polymer) = just a “big fat molecule”
1 double bond = unsaturated
More than 1 double bond = polyunsaturated
Saturated vs. unsaturatedsaturated unsaturated
Double Bond!
Saturated fats Most animal fats
solid at room temperature
Limit the amount in your diet contributes to
heart disease deposits in
arteries
Unsaturated fats Plant, vegetable & fish fats
liquid at room temperature the fat molecules
don’t stack tightlytogether
Better choice in your diet
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
Good vs. Bad CholesterolTotal Cholesterol Levels < 200
LDL = BAD!
Needs to be below 100
HDL = GOOD!!
Needs to be 60 or above
Triglycerides = BAD!
Needs to be 150 or below
Cholesterol Video 23:00http://player.discoveryeducation.com/index.cfm?guidAssetId=D0DC3225-D27A-4E3A-8CD0-
7BCB3B1241A4&blnFromSearch=1&productcode=US
Cholesterol Quiz http://www.americanheart.org/presenter.jhtml?identifier=3032767
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