Question

multiple choice question
tem specimens are ______.

fixed in a plastic - like matrix and cut into thin slices
mounted on a metal (typically aluminum) bunt and coated with a metal such as gold
placed between two thin panes of glass and sealed
chemically treated with silver nitrate prior to exposure to x - rays

Explanation:

Transmission Electron Microscopy (TEM) requires specimens to be extremely thin (usually 50-100 nm) to allow electrons to pass through. Specimens are first fixed, embedded in a plastic resin matrix, then sectioned into ultra-thin slices with a microtome. The other options describe sample preparation for other techniques: metal coating is for SEM, glass mounting is not standard for TEM, and silver nitrate treatment is for radiographic methods, not TEM.

Answer:

fixed in a plastic-like matrix and cut into thin slices