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):

  • enzymes
  • essential components of cell membranes
  • hormones (but don’t think that all hormones are proteins)
  • haemoglobin
  • antibodies
  • 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.


3.1 Amino acids and Peptide bonds

3.2 Structure (Briefly Explained)

3.3 Haemoglobin

3.4 Collagen (To come)


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