*HURRY PLEASE* ANSWER ONLY IF YOU ARE FOR SURE HELPP plz answer & EXPLAIN BOTHHH.

all of the following are functions of lipids in cells EXPECT
a) production of cellulose
b) storage of energy
c) secondary energy source
d) building of cell membranes

unlike carbohydrates & lipids, proteins contain --
a) hydrogen
b) oxygen
c) nitrogen
d) carbon