What is the function of lipids?

Lipids

Uses:– Long Term Energy Storage• LIPIDS ARE BEST AT ENERGY STORAGE

– Chemical messengers– Water-proofing– Structure– Cell membranes

Structure

• Elements in Lipids– C, H and a little bit of O

• Usually long chains of carbon and hydrogen with two oxygens on the end

• These long chains are generally called fatty acids

Saturated v. Unsaturated Fatty Acids

• Saturated Fatty acids have all single bonds

• Unsaturated Fatty acids have at least one double bond. They are BENT.

Form at Room Temperature

• Saturated Fatty Acids are solid at room temperature

• Unsaturated are liquid

Checkpoint Question

• Do you think saturated or unsaturated fatty acids cause more health problems?

• Why?

LIPIDS ARE NOT POLYMERS

• Lipids ARE NOT POLYMERS

• Lipids are just grouped together because:– They are all non-polar– They are all hydrophobic (hate water/can’t

dissolve in water)

• Types:– Triglycerides– Steroids– Wax– Phospholipids

Triglycerides

• One glycerol + three fatty acids

Steroids

• Four fused rings

Waxes

• A long chain alcohol linked to a long chain fatty acid

Phospholipid

• Found in membranes• Glycerol + 1 phosphate group + 2 fatty acids

Checkpoint:

• How is the structure of lipids related to their function in energy storage?