Metabolism could be a term that's accustomed describe all chemical reactions concerned in  permit the regulation of metabolic pathways in response to changes within the cell's Living organisms area unit distinctive therein they will extract energy from their environments and use it to hold out activities like t the cellular level of organization, the most chemical processes of all living matter area unit similar, if not identical. this can be true for animals, plants, fungi, or bacteria; wherever variations occur the variant processes area unit however variations on common themes. Thus, all living matter is formed of giant molecules referred to as proteins, which give support and coordinated movement, in addition as storage and transport of tiny molecules, and, as catalysts, modify chemical reactions to require place apace and specifically below delicate temperature, comparatively low concentration, and neutral conditions. Proteins area unit assembled from some twenty amino acids, and, even as the twenty six letters of the alphabet will be assembled in specific ways in which to create words of varied lengths and meanings, thus could tens or maybe many the twenty amino-acid “letters” be joined to create specific proteins.