Return to Question Document. Guanine is a purine and the purine ring is excreted as uric acid. Click on the tags below to find other quizzes on the same subject. Quickly memorize the terms, phrases and much more. Purines and pyrimidine are nitrogenous bases found in DNA and RNA. The answer you chose is highlighted in reverse video. Purines are made up of 2 Carbon nitrogen rings. Answer: B. They may be similar, but they are totally different in structure. cna. Some amino acids are necessary for purine synthesis. The number of rings this base has determines whether the base is a purine (two rings) or a pyrimidine (one ring). Question 1 of 16. In tissues that do not carry out active de novo synthesis, maintenance of an adequate supply of adenine nucleotides: . Overview. A. occurs primarily by adenine salvage using A-PRT. This includes Aspartate, glycine, and glutamine. This quiz has tags. 5. There is a printable worksheet available for download here so you can take the quiz with pen and paper.. Study Flashcards On Biochemistry Exam 4 - Purine & Pyrimidine Metabolism at Cram.com. Only the pyrimidine ring is cleaved. A. 3. This quiz tests how much you know about essential DNA biochemistry, including the shape of deoxyribonucleic acid and its bases. This is an online quiz called Purine and Pyrimidine Constituents. A. Transitions and transversions are equally likely B. Popular Quizzes Today. 5. The bases in the DNA helix are bound to each other via: hydrogen bonds covalent bonds ionic bonds metallic bonds 6. Quiz Questions. Pyridmidines have only a six-membered nitrogen-containing ring. A. covalently bonded to a sugar B. ionically bonded to a sugar C. hydrogen bonded to a sugar D. none of the above. To distinguish a defect in pyrimidine synthesis versus a defect in the urea cycle, which of the following should be measured in the blood? There are two kinds of nitrogen-containing bases - purines and pyrimidines. Small fragments C. Large genome D. None of these. 4. Purine and Pyrimidine Metabolism Quiz An infant is suffering from anemia with enlarged red blood cells. US States Double Border Blitz Map 11,518; 5x5 in 90: Mixed Holiday Minefield Blitz 10,375; Find the US States - No Outlines Minefield 7,910; Hide Europe's Flags (Minefield) 6,725 Click the 'J' Movie Title Character 6,287; More Quizzes In gel electrophoresis, what fragments will move most quickly through a gel? Cram.com makes it easy to get the grade you want! Each DNA strand has a ‘backbone’ that is made up of a sugar-phosphate chain. Nucleoside is a pyrimidine or purine base. A. Ammonia B. Carbamoyl phosphate C. Folate D. ANS: Transitions change a pyrimidine into a pyrimidine or a purine into a purine. His urine is examined and found to exhibit increased levels of orotic acid. Large fragments B. What are Purines and Pyrimidines? About this Quiz. The correct answer is in bold. The molecular formula of purine is C5H4N4. ... purine and pyrimidine bases 5. Which of the following is TRUE with respect to mutations? Purines consist of a six-membered and a five-membered nitrogen-containing ring, fused together. : The Basics. Attached to each one of these sugars is a nitrogenous base that is composed of carbon and nitrogen rings. Answer: A. There are 4 purines and 4 pyrimidines that are of concern to us.