The C-terminal region of the protein adenylate kinase contains a sequence of amino acids with hydrophobic residues in bold occurring roughly every 3-4 amino acids. This periodic spacing of hydrophobic residues suggests the protein sequence forms an alpha-helix structure with opposing hydrophilic and hydrophobic faces. Therefore, the sequence displayed is amphipathic.

1. In the protein adenylate kinase, the C-terminal region has the sequence Val-Asp-Asp-Val-Phe-
Ser-Gin-Val-Cys-Thr-His-Leu-Asp-Thr-Leu-Lys- The hydrophobic residues in this sequence are
presented in boldtace type. Suggest a possible reason for the periodicity in their spacing. Match
the ltems in the left column to the appropriate blanks in the sentences on the right. The
hydrophobic residues in this sequence tend to recur roughly every 3.4 amino acids, suggesting
that the protein sequence shown is in the form of an comprising residues. Such a sequence would
result in a structure which has opposing faces. Thus, this sequence is that of an amphipathic (or
amphiphilic)