8. Which of the following is responsible for making every amino acid unique?

A. Amino group
B. Hydrogen
C. Carboxyl group
D. "R" group

9. Enzymes are:

A. DNA
B. Lipids
C. Carbohydrates
D. Proteins

10. A protein molecule is made of:

A. Amino acids
B. Glycerol and fatty acids monomers
C. Glucose monomers
D. Only fatty acids