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Chains of which macromolecules form proteins?

  1. Amino acids

  2. Carbohydrates

  3. Lipids

  4. Nucleic acids

The correct answer is: Amino acids

Proteins are formed by chains of amino acids. Amino acids are the building blocks of proteins, and when linked together in specific sequences, they form long chains known as polypeptides, which ultimately fold into functional protein molecules. Carbohydrates, lipids, and nucleic acids do not form proteins; each of these macromolecules has distinct structures and functions in the body.