Multiple choice The crystals of urate oxidase are seen in: mitochondria mesosomes peroxisomes lysosomes Reveal answer Fill a bubble to check yourself C Correct answer Explanation Peroxisomes contain urate oxidase, which catalyzes uric acid oxidation to allantoin (more soluble). Mitochondria produce ATP, mesosomes are bacterial membrane structures, and lysosomes contain digestive hydrolases - none house urate oxidase crystals.