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Anabolism is a group of metabolic processes in which energy is consumed for the synthesis of complex molecules. These molecules, the how to lose weight fast building blocks of all living cells are formed step by step from simple compounds of relatively small size. There are three basic stages anabolism: the first involves the production of amino acids, monosaccharides, isoprenoids and nucleotides, the basic elements of biomolecules. In a second step, these molecules are activated to reactive forms of energy derived from ATP, and the third stage is a combination of particles produced in complex molecules - proteins, polysaccharides, lipids and nucleic acids. Individual organisms differ in the number of types of particles produced. Autotrofy, such as plants, build up in their cells, complex molecules from simple particles such as carbon dioxide and water. Heterotrofy, in turn, require for their production of more complex substances - monosaccharides or amino acids. Type of energy source can be used as a criterion for classification of organisms: fotoautotrofy and fotoheterotrofy acquire energy from sunlight, and chemoautotrofy and chemoheterotrofy - from the oxidation of inorganic compounds.
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