Final answer:
Polypeptides are amino acid chains linked by peptide bonds, with longer ones termed proteins. The structure of proteins influences their solubility.
Explanation:
Polypeptides are chains of amino acids linked by peptide bonds. These chains can vary in length, with shorter ones often referred to as peptides and longer ones as proteins. Proteins can have various structures, such as globular or fibrous, affecting their solubility in water.
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