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Sagot :
Proteins are macromolecules formed by structural units called amino acids, they are the main source of nitrogen that are required in various synthetic pathways.
What are proteins?
Proteins are macromolecules present in cells that coordinate multiple vital functions, they are also known as polypeptides.
They are the nutrients that form tissues, transport vitamins and are essential for growth, thanks to their nitrogen content, which is not present in other molecules such as fats or carbohydrates.
Therefore, we can conclude that proteins are macromolecules (very large molecules) that are the main source of nitrogen atoms for the human body.
Learn more about proteins here: https://brainly.com/question/10670347
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