Which of the following correctly describes the primary and tertiary structures of a protein. A. The primary structure is the amino acid chain; the tertiary structure is the mRNA sequence.

B. The primary structure is the mRNA sequence; the tertiary structure is the amino acid chain.

C. The primary structure is the amino acid chain; the tertiary structure is the protein’s shape.

D. The primary structure is the protein’s shape; the tertiary structure is the amino acid chain.