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What kind of molecules are proteins?

  1. Monosaccharides

  2. Disaccharides

  3. Polysaccharides

  4. Polypeptides

The correct answer is: Polypeptides

Proteins are large, complex molecules made up of amino acids, making them polypeptides. Options A, B, and C are not correct because monosaccharides, disaccharides, and polysaccharides are types of carbohydrates, not proteins. Proteins also have a specific structure and function that is unique to their composition of amino acids, making them different from the options provided.