An experiment looking at structures smaller than a cell would most likely employ a
a. dissecting microscope
b. transmission electron microscope
c. scanning electron microscope
d. compound light microscope

The correct answer is option b.

Explanation:

Transmission electron microscope or TEM emits electrons that pass through the vacuum tube of the microscope. TEM has an electromagnetic lens that focuses the electrons into a very fine beam.

The transmission electron microscope can be used to seeing very thin specimens of tissue sections, molecules, and other smaller structures that can not be seen by light microscope or dissecting microscope, in which electrons can travel creating a projection image.

Thus, the correct answer is option b.