5.1 Lipids and celluar membranes

Question 1

what is a lipid? are they hydrophilic or hydrophobic? how well do they mix?

Answer 1

fatty acid organic compounds. they all have hydrophobic behaviour and mix poorly

Question 2

what are the three types of lipids?

Answer 2

fats (tryglicerides), phospholipids and steroids

Question 3

what is so important about phospholipid properties? eg how they ar ewith water and charges, what they create

Answer 3

there are two hydrocarbon tales that are hydrophobic and one negative electric charged glycerol head that is hydrophilic. creates bilayers in cell membranes

Question 4

how many rings does a steroid have? is the skeleton made out of hydrogen, nitrogen, hydoxyl or carbon?

Answer 4

steroids have four carbon fused rings. variety occurs with the chemical groups attached

Question 5

what is a celluar membrane?

Answer 5

a membrane that seperates the inside and outside of cell

Question 6

what are the three molecules celluar membranes are made from?

hint think of food

Answer 6

lipids, proteins and carbohydrates

Question 7

what are celluar membranes held together by?

hint: its a strong bond

Answer 7

by hydrophobic interactions witha phosholipid bilayer