3. Proteins are made up of polypeptide chains. Polypeptide chains are composed of
O A. mRNA
O C. URNA
O BrRNA
O D. amino acids.

Respuesta :

Proteins consist of one or more polypeptide chains. Each polypeptide chain consists of smaller sub-units or amino acids that are linked together. Amino acids serve as the building blocks of polypeptides, and polypeptides serve as the building blocks of proteins
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