alleryStart learning →In a scanning electron microscope, what does the beam of electrons do?
AIt moves back and forth across the cell surface
BIt penetrates the cell and crosses its interior
CIt is focused into a fixed spot on one organelle
DIt is split into two beams by a prism system
Answer & Solution
Correct answer: A. It moves back and forth across the cell surface
1. The scanning design is named for the sweeping motion of its beam.
2. That beam moves back and forth across the surface of the cell.
3. The sweep builds up details of cell surface characteristics rather than of the interior.
4. A beam that penetrates the cell describes the transmission design instead.
5. The scanning beam moves back and forth across the cell surface.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 4 "Cell Structure", section 4.1 Studying Cells_
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