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Structure of RNA can be studied by

1. Feulgen
2. Toluene blue
3. x-ray crystallography
4. chromatography

Correct answer: x-ray crystallography

Solution

X-ray crystallography is used to determine the three-dimensional structure of molecules, including RNA, by analyzing how X-rays diffract through a crystal. The other options are mainly stains or separation methods, not structural determination techniques.

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