Final answer:
Transmission Electron Microscopy (TEM) is the electron microscope technique that is well suited for capturing subunit structures of high-molecular weight aggregates like viruses, ribosomes, multisubunit enzymes, and protein complexes.
Step-by-step explanation:
The electron microscope technique that is well suited for capturing subunit structures of high-molecular weight aggregates like viruses, ribosomes, multisubunit enzymes, and protein complexes is Transmission Electron Microscopy (TEM).
TEM accelerates electrons that are emitted from a hot filament, and the beam passes through the sample. A magnetic lens focuses the beam image onto a fluorescent screen, a photographic plate, or a light sensitive camera. The resulting micrograph in TEM stands out because the specimens are brighter than the viewing screen.