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img055 - 13.‘ 14 19 Which of the following is a common...

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Unformatted text preview: 13.‘ 14. 19. Which of the following is a common intermediate in the biosynthesis of both purine and pyrimidine nucleotides by the de novo pathways? WW 5—phosphoribosyl-l-pyrophosphate ~/ Phosphoribosylamine Inosinic acid Orotidine 5'—phosphate Hypoxanthine In mammalian cells the nitrogen atoms of the pyrimidine ring are derived from: A. B. Aspartate, glutamine and glycine Ammonia, glutamine and aspartate Urea and ammonia Glycine, ammonia and glutamate @ Glutamine and aspartate / For questions 15-17, choose the most correct response from the following list: 1‘ r._ A. The ribosome platform. B. The ribosome sholder. C. The ribosomal\ A site D. The ribosomal P site. B. The ribosomal E site a 0 The translocase factor (EF-G) moves the growing peptide chain from Mfi‘g? D Binding site for initiator tRNA A W C Location of the Shine-Dalgarno interaction. #5" z“ \ 1,- , dUMP dUDP dUTP dTMP dTDP Hypoxanthine-Guanine Phosphoribosyltransferase (HGPRT) A. ,3. 6?? E. is involved in the salvage pathway of pyrimidines. has binding sites for both hypoxanthine and ATP. activity is deficient 1n individuals having the Lesch- Nyhan Syndrome is involved in the de novo pathway of pyrimidines is involved in the de novo pathway of purines. ...
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