Unfortunately, a microscope will not allow you to see the double helical structure of the DNA molecule. You’ll only see a massive mess of many, many DNA molecules clumped together. In fact, the width of the DNA double helix is approximately one billionth of a meter! This is much too small to see, even with the most powerful microscope. Instead, a technique called X-ray crystallography can be used to produce a picture of the DNA molecule. It was by looking at such a picture (taken by Rosalind Franklin) that James Watson and Francis Crick were able to figure out what the DNA molecule looks like.
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