Final answer:
A. Transmission Electron Microscopy (TEM) is a type of electron microscope where a beam of electrons is transmitted through a biological sample. It allows us to see individual atoms and the structure of cell nuclei.
Step-by-step explanation:
A. TEM stands for Transmission Electron Microscopy. It is a type of electron microscope where a beam of electrons is transmitted through a biological sample.
The electrons are emitted from a hot filament and pass through the sample, which is then focused onto a detector to capture the image. TEM allows us to see individual atoms and the structure of cell nuclei, with magnifications up to 100 million times the size of the original object.