Explain about Simple proteins

Simple proteins are those which are made of amino acid units only joined by peptide bond.  Upon hydrolysis they yield a mixture of amino acids and nothing else.  

Examples:

Albumins: Egg albumin, serum albumin, Lactalbumin

Globulin: Tissue globulin, serum globulin.

Gliadins:  Wheat gliadin, hordein (barley) etc.

Albuminoids: Keratin of hairs, skin, egg shell and bones, elastin, Collagen of tendons, ligaments and bones.

 Histones:  globin of haemoglobin.

Protamine:  Salmine, the spermatozoa of salmon fish.