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:

Ventricles

Lower chambers of the heart that receive blood from the atria and pump it out to the lungs and the rest of the body.

ECG

Electrocardiogram; a diagnostic tool that measures and records the electrical activity of the heart, helping detect heart abnormalities.

QRS Complex

A series of three deflections on an electrocardiogram (ECG) representing the electrical activity during the ventricular contraction phase of the heart cycle.

ECG

Electrocardiogram, a diagnostic tool that records the electrical activity of the heart, used to detect heart conditions by measuring the timing and duration of each electric phase in the heartbeat.