In Hemoglobin, a ____ Protein, the Space Between the Helices

Multiple Choice

In hemoglobin, a ____ protein, the space between the helices is filled efficiently and tightly with mostly ____ amino acid chains and with ____ side chains facing the outside of the protein structure.

A) globular, hydrophobic, polar
B) globular, polar, nonpolar
C) fibrous, hydrophobic, nonpolar
D) fibrous, polar, nonpolar
E) none are true