The uric acid cycle is a cyclic adaptation of the process used for mammalian purine catabolism. Inosine monophosphate (IMP) is formed which reacts with pyrophosphate to form hypoxanthine and 5-phosphoribosylpyrophosphate (PRPP). This reaction is catalysed by hypoxanthine phosphoribosyltransferase (EC 2.4.
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A sample of urine is added to a substance that promotes the growth of germs. If no germs grow, the culture is negative. If germs grow, the culture is positive. The type of germ may be identified using a microscope or chemical tests.
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