In the process of assimilation due to the low molecular weight compounds in the cells synthesized high molecular weight organic compounds. Depending on the sources of substances that enter the body from the external environment and are used for assimilation, all organisms are divided into two groups: autotrophic and heterotrophic. Autotrophic organisms get from the environment inorganic substances (CO2, H2O, mineral salts, etc.) and are synthesized organic. These include all green plants on our planet, and some bacteria. the Heterotrophic organisms are unable to synthesize organic substances from inorganic ones, so processes of assimilation they need to receive organic substances from the outside in the form of food. Getting into a heterotrophic organism, food is digested, that is, proteins are split into amino acids, complex carbohydrates — simple and so on. And then from these simple organic substances in the cells of heterotrophic organisms are the processes of synthesis of complex organic substances coming from to build their bodies. To the heterotrophic organisms include all animals, many microorganisms and some plants (e.g., mushrooms).
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