Electron Cryomicroscopy Can Be Used to Cause Membrane Proteins to Become

Multiple Choice

Electron cryomicroscopy can be used to cause membrane proteins to become closely packed at very low temperatures into two-dimensional crystalline arrays within the plane of a membrane. The structures of such proteins are then determined from combined, high-resolution electron microscope images of many different protein molecules taken at various angles. This process is called __________.

A) cryopreservation
B) electron crystallography
C) cryohistology
D) electron cryocrystallography
E) proton microscopy