Complex molecules constructed from long chains of amino acids polymerized together

lipids
proteins
carbs
nucleic acids

Proteins

Explanation:

Amino acid is a monomer. It is the building block of the polymer protein. Amino acids join to one another through peptide linkages to form a polypeptide. Polypeptides combine with each other in a 3D conformation to form proteins. There are 20 different amino acids in the cell. Amino acids have different side chains which make them acidic, basic, neutral, polar or non-polar.

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