Proteins are an extremely important class of macromolecules. More than 50% of the dry mass of most cells is protein.
Proteins can behave as (or act as):
- essential components of cell membranes
- hormones (but don’t think that all hormones are proteins)
- building block for hair or nails (keratin)
- muscles contract as a response to actin and myosin, which are proteins
- food storage products
All proteins are made of amino acids.
GO FURTHER TO:
3.2 Structure (Briefly Explained)
3.4 Collagen (To come)