Final answer:
It is B. false that the two major types of electron microscopy are Transmission electron microscopy and cryoelectron microscopy.
Step-by-step explanation:
The student's question addresses the major types of electron microscopy (EM), a crucial tool in modern biology and materials science. In response to the student's interrogation, it is false that there are two major types of electron microscopy as Transmission electron microscopy (TEM) and cryoelectron microscopy. In fact, the two major types are Transmission electron microscopy (TEM) and Scanning electron microscopy (SEM).
TEM functions by emitting electrons from a hot filament and passing them through an examined sample in a vacuum. Magnifications can reach up to 100 million times the original size, and resolutions can distinguish details as small as 0.1 nm, allowing us to view individual atoms and cell structures. Conversely, SEM involves scanning a beam of electrons across a sample's surface to reveal intricate details of surface characteristics, coated with a metal such as gold for improved imaging. Despite their different applications, both types are significantly more bulky and expensive than light microscopes and are intricate tools for visualizing structures beyond the capabilities of optical microscopy.