The Three-Dimensional Conformation of a Protein May Be Strongly Influenced

The three-dimensional conformation of a protein may be strongly influenced by amino acid residues that are very far apart in sequence. This relationship is in contrast to secondary structure, where the amino acid residues are:

A) always side by side.
B) generally near each other in sequence.
C) invariably restricted to about 7 of the 20 standard amino acids.
D) often on different polypeptide strands.
E) usually near the polypeptide chain's amino terminus or carboxyl terminus.