Multiple Choice
Who was responsible for the initial base pairing experiment that provided key evidence for the structure of DNA?
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1. Introduction to Genetics
History of Genetics
Multiple Choice
In the history of genetics, the first strands of DNA were directly observed using which type of microscope?
A
Scanning tunneling microscope
B
Fluorescence microscope
C
Electron microscope
D
Light (compound) microscope
Verified step by step guidance1
Understand the types of microscopes listed: Scanning tunneling microscope, Fluorescence microscope, Electron microscope, and Light (compound) microscope.
Recall that DNA strands are extremely small, on the order of nanometers, which is beyond the resolution limit of light microscopes.
Recognize that electron microscopes use electron beams with much shorter wavelengths than visible light, allowing them to resolve much smaller structures like DNA strands.
Note that the first direct observations of DNA strands required the high resolution provided by electron microscopy, as light and fluorescence microscopes cannot resolve such fine details.
Conclude that the electron microscope was the type of microscope used to directly observe the first strands of DNA.
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