They are composed of chains of made of carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur
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Ответ:
amino acids
Explanation:
Proteins are made up of small units called amino acids. The proteins are composed of carbon, hydrogen, oxygen and nitrogen. In addition to nitrogen, proteins may contain phosphorus or sulphur or both. The proteins are referred to as nitrogenous compounds because they contain nitrogen element.
Ответ: