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:

DNA Fingerprinting

A technique used to identify individuals by examining their DNA sequence variations.

Short Tandem Repeats

DNA sequences where a short sequence of bases is repeated, often used in genetic fingerprinting.

Taq Polymerase

An enzyme used in PCR (Polymerase Chain Reaction) to amplify DNA sequences, known for its ability to withstand high temperatures.

PCR

A laboratory technique used to amplify DNA sequences, making millions of copies of a specific DNA segment for analysis.