Question

question 1 - 1
the list below contains the names of different types of microscopes that are used by scientists in a variety of fields.

• compound microscope
• transmission electron microscope
• dissection microscope
• scanning electron microscope

which of the following microscopes require that specimens be non - living in order to be observed?

• compound microscopes and dissection microscopes
• scanning electron microscopes and dissection microscopes
• compound microscopes and transmission electron microscopes
• transmission electron microscopes and scanning electron microscopes

Explanation:

Transmission electron microscopes (TEM) and scanning electron microscopes (SEM) require specimens to be non - living. Specimens for TEM are thinly sliced and chemically fixed, and SEM specimens are coated with a thin layer of metal and placed in a vacuum, both of which kill the specimens. Compound and dissection microscopes can be used to observe living specimens.

Answer:

D. transmission electron microscopes and scanning electron microscopes