Question

a researcher wants to observe the behavior of a living bacterium. according to the source material, which type of microscope should be used and why? a transmission electron microscope, as it reveals the internal structures of the living cell. a scanning electron microscope, because it provides the highest magnification of the cells surface. any microscope, but staining must be avoided to keep the organism alive. a light microscope, because the specimen does not need to be in a vacuum and can remain alive.

Explanation:

• Transmission electron microscopes require specimens to be dead (fixed, dehydrated, etc.), so they can't be used for living bacteria.
• Scanning electron microscopes also need specimens to be dead (coated, in vacuum), so they are not suitable.
• Not any microscope can be used. For example, electron microscopes (transmission and scanning) need non - living specimens.
• Light microscopes don't require a vacuum for the specimen. So, living bacteria can be observed under a light microscope.

Answer:

A light microscope, because the specimen does not need to be in a vacuum and can remain alive.