Protein Function Question?

Question

Their is more than one correct statement to this. Which of these are true about proteins.
Functions of proteins are:
a. Muscle Contraction
b. Heat loss prevention
c. food digestion
d. sugar level regulation
e. cell membrane formation
f. energy storage
g. involvement of steroid synthesis
h. Genetic Material storage

Remember that more than one letter can be correct. Thanks

Answer 1

http://fig.cox.miami.edu/~cmallery/255/255prot/255proteins.htm