What Is the Reason That a Modern Electron Microscope (TEM)can

question 19

Multiple Choice

What is the reason that a modern electron microscope (TEM) can resolve biological images to the subnanometer level, as opposed to tens of nanometers achievable for the best super-resolution light microscope?

• A) The focal length of the electron microscope is significantly longer.
• B) Contrast is enhanced by staining with atoms of heavy metal.
• C) Electron beams have much shorter wavelengths than visible light.
• D) The electron microscope has a much greater ratio of image size to real size.
• E) The electron microscope cannot image whole cells at one time.

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Definitions:

Rheumatoid Factor

An antibody found in the blood that is a common indicator of rheumatoid arthritis.

Autoantibody

An antibody produced by the immune system that mistakenly targets and attacks the body's own tissues or cells.

Phagocytosis

The process by which cells, especially immune cells, engulf and digest foreign particles or pathogens.

Antigens

Substances that the immune system recognizes as foreign or dangerous, triggering an immune response.