Tutorial_10_ans - Tutorial 10 Biochem 300 Biochem 300...

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Unformatted text preview: Tutorial 10 Biochem 300 Biochem 300 Tutorial 10 Aug 11 th Topics: Nucleoside biosynthesis, regulation, DNA structure, DNA synthesis & polymerization 1. In the biosynthesis of the pyrimidine ororate, fragments of many molecules are combined together to form the ring. Which molecule does not contribute atoms to this final structure? a) Aspartate b) Glutamine c) CO 2 (or HCO 3- ) d) Glutamate e) This is a trick, they ALL contribute atoms to the final structure 1. In the biosynthesis of the pyrimidine ororate, fragments of many molecules are combined together to form the ring. Which molecule does not contribute atoms to this final structure? a) Aspartate b) Glutamine c) CO 2 (or HCO 3- ) d) Glutamate e) This is a trick, they ALL contribute atoms to the final structure Pyrimidine Synthesis 2. What is the primary difference between biosynthesis of purines and pyrimidines? a) Purines require energy for biosynthesis but pyrimidines do not. b) Amino acids are used for building blocks for pyrimidines but not for purines. c) Purines are synthesized on the ribose ring and pyrimidines are synthesized and then attached to the ribose ring. d) The committed step for pyrimidine biosynthesis occurs early in the biosynthetic pathway but the committed step for purine biosynthesis is late in the biosynthetic pathway. e) Purine biosynthesis is subject to feedback inhibition but pyrimidine biosynthesis is not. 2. What is the primary difference between biosynthesis of purines and pyrimidines? a) Purines require energy for biosynthesis but pyrimidines do not. b) Amino acids are used for building blocks for pyrimidines but not for purines....
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This note was uploaded on 12/13/2011 for the course BIOLOGY 300 taught by Professor Asdf during the Spring '08 term at The University of British Columbia.

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Tutorial_10_ans - Tutorial 10 Biochem 300 Biochem 300...

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