【单选题】Gout is caused by the deposition of urate crystals in the joints and kidney. Purines are metabolized to uric acid, whereas pyrimidines, when metabolized, do not generate uric acid. Which one of the fo...
【简答题】2020_1 Passage Four For Five years I was Breaking Bad's science adviser, helping writers get all their scientific facts right. I answered questions about chemical reactions, provided chemical structur...