Lipids

r

a group of biomolecules that play an important role in living organismsprimary function: long-term energy storageother functions: used for protection, insulation, lubrication, precursors for hormones, key component of cell membranesinsoluble in water (hydrophobic)

Triglycerides

Functions

Long-Term Energy Storage

Protection

Insulation

Subunit Molecules

Glycerol

Fatty Acids (3)

r

has 3 main parts: the hydrocarbon chain (the chain of carbon and hydrogen atoms), a methyl group at one end, an acid group at the other endfatty acids move about and take an organized structure (micelle)

Saturated

r

only single carbon to carbon bonds (this is because the carbon chain is saturated with all the hydrogen atoms it can hold)

Unsaturated

r

known as cis fatty acidshave one to several double bondsdouble bonds result in kinks in fatty acids which can affect the melting point of the fat

Trans Fat

r

an unsaturated fat where the hydrogen atoms are on opposite sides of the double bondusually formed during the production of processed foods (also common in partially hydrogenated oils)associated with cardiovascular disease

Fats

r

solid at room temperatureused by animals for insulation, protection, and long-term energy storage

Lard

Butter

Oils

r

liquid at room temperature used by plants for long-term energy storage

Corn oil

Olive oil

Phospholipids

r

unique properties in regard to watertend to arrange themselves so that only hydrophilic heads interact with the water environment and the hydrophobic tails crowd inward away from the waterthis structure is a major component of plasma membranes of the cellmake a structure called the phospholipid bilayercan move past each other freely

Functions

Critcial for Cell Membranes

Form Structures for Transportation Throughout the Bloodstream

Phospholipid Bilayer

r

found in the membrane of the cellmembranes are fluid mosaic

Subunit Molecules

Glycerol

Fatty Acids (2)

r

fatty acids move about and take an organized structure (micelle)

Phosphate Group

r

the phosphate head of the molecule is hydrophilic (mixes well with water)

Steroids

Functions

Play Roles in Reproduction

Helps Immune Functions

Help Contol Metabolism

Fused rings of carbon (4)

r

each fused ring has different functional groups attached

Cholesterol

r

Serves as a precursor for the synthesis of other steroidspresent in plasma membranes, where it stabilizes the membrane

Testosterone

r

have small differences in its functional groups, but large differences in its effect on an organism

Estrogen

r

have small differences in its functional groups, but large differences in its effect on an organism

Vitamin D

r

have small differences in its functional groups, but large differences in its effect on an organism

Cortisone

r

have small differences in its functional groups, but large differences in its effect on an organism

Waxes

r

non-polar (rebel water)

Functions

Energy-Storage Substances

Water repellents

Purposes

bees construct honeycombs from wax

produced in the ears of some animals to protect the eardrums

Where is it found

the protective coating of leaves

outer surfaces of animals