Q: Crystallography is a visualization technique to determine the arrangement of atoms in solids. It has been incredibly useful in discovering the structures of many proteins, such as hemoglobin. Difficulties arise when crystallography is attempted on non-polar molecules, such as proteins high in valine or alanine. Using this information, which of the following would be most difficult to visualize using crystallography?
A		A ribosome
B		A viral protein from HIV
C		A trans-membrane protein
D		A digestive protease

Membrane Transport and Signalling | Eukaryotic Cells |