Which row concerning protein structure is correct?
- Aprimary structure: the number of amino acids present in a protein; secondary structure: the left-handed spiral formed by the primary structure; tertiary structure: the result of cross-bonding between specific amino acids in the primary structure
- Bprimary structure: the order of amino acids present in a protein encoded by DNA; secondary structure: the coiling of a chain of amino acids to form a $eta$-pleated sheet; tertiary structure: the shape formed by folding of a polypeptide and held together by hydrogen bonds
- Cprimary structure: the result of translation of an mRNA molecule by a ribosome into a chain of amino acids; secondary structure: occurs because of attraction between hydrogen and oxygen atoms in the side chains; tertiary structure: the result of ionic and hydrogen bonds, disulfide bridges and hydrophobic interaction between amino acids
- Dprimary structure: the sequence of amino acids in a protein coded by an mRNA molecule; secondary structure: formed by hydrogen bonding between amino acids forming the primary structure; tertiary structure: formed as a result of interaction of the side chains of amino acids in the primary structure