Proteins

-chains of amino acids
-NH2 on one end; COOH on the other
-peptide linkage

Types:
i. Primary
ii. Secondary
-folded from primary
-helix
-pleated sheet
iii. Tertiary
-folded from secondary
-globular proteins
iv. Quaternary
-folded from tertiary

Types of amino acids:
i. Essential-->must be taken from food
ii. Non-essential-->made by the body