An electron microscope can reveal detail that a light microscope cannot because
Correct answer: B. the wavelength of an electron beam is far shorter, giving much greater resolving power
- A. it magnifies the specimen many more times
- B. the wavelength of an electron beam is far shorter, giving much greater resolving power
- C. it can be used on living specimens
- D. it uses ultraviolet light instead of visible light
Explanation
Resolution is limited by wavelength, and the very short wavelength of an electron beam allows two points less than a nanometre apart to be seen as separate, against about 200 nanometres for a light microscope. Magnification without resolution simply enlarges a blur, which is the distinction the question is testing. The specimen must be dead and in a vacuum, so living material cannot be examined.
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About Prokaryotic and Eukaryotic Cells
Prokaryotic cells lack a membrane-bound nucleus and complex membrane-bound organelles, whereas eukaryotic cells contain a nucleus, specialized organelles and a cytoskeleton. Comparisons include DNA organization, ribosomes, cell walls, size, division and examples such as bacteria, archaea, protists, fungi, plants and animals.
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