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
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
dTDP Hypoxanthine-Guanine Phosphoribosyltransferase (HGPRT) A.
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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- Spring '08