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