PROTEINS Introduction Proteins are the most abundant organic compounds to be found in cells and comprise over 50% of their total dry weight. They are present in all types of cells and in all parts of the cell. Function Proteins perform many functions. Some of their important functions are; They build many structures of the cell. All enzymes are proteins and in this way they control the whole metabolism of the cell. Some hormones are also proteins and regulate metabolic processes. Some proteins (e.g. haemoglobin ) work as carriers and transport specific substances such as oxygen, lipid, metal ions etc. Some proteins called antibodies , defend the body against pathogens. Blood clotting proteins prevent the loss of blood from the body after an injury. Movement of organs and organisms and movement of chromosomes during anaphase of cell division, are caused by proteins. Amino acids as units of protei...
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