Mod 3 Flashcards
Phospholipids
Type of LIPID. Major component of the CELL MEMBRANE
Have glycerol backbone, attached to fatty acids, and a phosphate head.
Phosphate Group
Hydrophilic functional group
Steroids
A type of Lipid.
Ex. Cholesterol, used to create hormones
Steroid makeup
20 carbon atoms bonded to form 4 fused rings
C-C and C-H bounds make if HYDROPHOBIC
Unsaturated Lipid
Double Bonded H-atoms. They create kinks, reducing the TIGHTNESS of the molecules and the number of van der Waals interactions.
Lower melting point
As length on hydrogen chains increase in fatty acids…
The number of Van Der Walls interactions also increase.
Lower melting point
Less Van der waals interactions
Van der Waals forces
A interaction of temporarily polarized molecules WEAKLY ASSOCIATE with one another because of the polarity.
Only come into play when atoms are VERY CLOSE to one another and they ARE WEAKER THAN H-BONDS
Help STABILIZE MOLECULES
Fatty Acids are HYDROPHOBIC BECAUSE
They do not contain polar covalent bonds
Electrons uniformly distributed
What causes partial charges in fatty acids
The constant motion of electrons leads to regions of partial charges
What do lipids play roles in
They store long-term energy and are critical in CELL COMMUNICATION
Richest sources of enregy
C-C bonds and C-H bonds
Glycerol makeup
3 Carbon molecules with a hydroxyl (-OH) group attached to each
Fatty Acid makeup
Hydorgen-carbon chains attached to a carboxyl group (-COOH)
Carboxyl group of fatty acid
a functional group
able to react with hydroxyl group of glycerol and when it reacts, two molecules are joined by COVALENT BONDS—> DEHYDRATION SYNTHESIS
