| 31. | Then a final cyclisation occurs to make uracil.
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| 32. | RNA uses uracil in place of thymine.
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| 33. | Biologically relevant molecules identified so far include uracil, an RNA nucleobase, and xanthine.
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| 34. | In the gas phase, uracil has 4 sites that are more acidic than water.
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| 35. | Uracil can also be synthesized by a double decomposition of thiouracil in aqueous chloroacetic acid.
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| 36. | There are some rare cases where thymine does occur in RNA and uracil in DNA.
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| 37. | For example, the uracil base can be combined with deoxyribose-1-phosphate.
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| 38. | The presence of nitrous acid can cause transition mutations, by converting cytosine to uracil.
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| 39. | The most common nitrogenous bases are adenine, cytosine, guanine, thymine, and uracil.
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| 40. | However, it is inherently unstable, and can change into uracil ( spontaneous deamination ).
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