T1: Lipids

Question 1

types of lipids

Answer 1

triglycerides and phospholipids

Question 2

structure of a triglyceride

Answer 2

3 fatty acids and 1 glycerol molecule

formed by condensation, 3 ester bonds per triglyceride

for one triglyceride to form 3 water molecules are released

Question 3

triglyceride structure and function

Answer 3

long hydrocarbon tail of fatty acids SO they contain lots of energy

insoluble SO don’t affect the water potential of cells

Question 4

how do triglycerides clump together?

Answer 4

fatty acid tails are hydrophobic so face inwards shielding themselves from water using the hydrophilic glycerol heads

Question 5

structure of a phospholipid

Answer 5

2 fatty acids, 1 glycerol, 1 phosphate group

2 ester bonds, 1 phosphodiester bond

Question 6

phospholipid structure and function

Answer 6

make up the bilayer of cell membranes

hydrophobic tails and hydrophilic heads SO form a bilayer with heads facing out towards water on both sides

centre of bilayer is hydrophobic SO contains water soluble substances well