An example of the keratin is that it is the protein of hair, feathers and horns and other appendages. Usually, its bugs that use silk fibers such as insects and spiders they use it to make their cocoons and webs. Elastin and collagen proteins provide a fibrous framework in animal connective tissue. What are proteins? They are large and complex molecules that play many critical roles in the body. Proteins do most of the work in the cells and are required for the structure, function and regulation of the body's tissues and organs. …show more content…
They include kertains , actins and myosin's which are found in muscle which are found in muscle tissue and the silks and insect fibers. For example, Kertains from protective covering for skin, fur , hair , claws, nails , hooves ,hornes , beaks and feathers. The effects of structural proteins are the destruction of secondary and teritary structures. Since denaturation reactions are not strong enough to break the peptide bonds, the primary structure remains the same after a denuration process. These proteins have functions enzymatic functions signaling functions and rarely be used to store energy. What makes proteins? Nature