* They are the fundamental constituents of all protoplasm and are involved in the structure of a living cell and in its functions. Enzymes are proteins which act as biocatalysts.
* Proteins serve as components of the tissues holding the skeletal elements together. Nucleoproteins serve as carrier of genetic characters and hence govern inheritance of traits.
* They execute their activities in the transport of various compounds. Some hormones are proteins which regulate numerous physiological functions.They function in the homeostatic control of the volume of the
circulating blood.
*They are involved in blood clotting through thrombin, fibrinogen and other protein factors. They act as the defense against infections by means of antibodies.
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