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Why did Watson & Crick believe the sugar in DNA was Deoxyribose?

Why did they think the sugar in DNA was deoxyribose and not just ribose?

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It was most likely based from mass spectroscopy studies to understand the chemistry of DNA versus RNA. This sort of analysis would have shown that DNA lacked the hydroxyl group on the sugar

It had already been determined that DNA was made up of A, T, C, G, and that the number of T's equal the number of A's, and the number of G's equal the number of C's. It was not fully understood how these nucleic acids organize themselves to form the structure of DNA. This is what Watson, Crick, Wilkins and Franklin finally determined by X-ray crystallography.