Download OU B.Sc 2019 Dec 5th Sem (3rd Year) 8211 Biochemistry Molecular Biology Question Paper

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Code No.8211
Paper : VI - A (DSE E-1
Time: 3 Hours

Part — A (5x3=15 Marks)

Answer any FIVE of the following eight questions:

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1. Topoisomerases.
2. Griffith's experiment.
3. Inhibitors of RNA synthesis.
4. Sigma factors.
5. Genetic code.

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6. Ribosome structure.
7. DNA polymerases I, II, III of E.coli.
8. Structure of t-RNA.

Part — B (3x15=45 Marks)

Answer all the following THREE questions:

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1. (a) Write about models of replication and explain proof for semi-conservative model.
   OR
   (b) Describe the bi-directional replication model of E.Coli with a neat suitable diagram.
2. (a) Explain the initiation, elongation and termination of transcription in prokaryotes.
   OR
   

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   (b) Explain the post-transcriptional modifications of eukaryotic m-RNA.
3. (a) What is Lac-operon? Explain the induction and repression of prokaryotic gene expression with reference to Lac operon.
   OR
   (b) Write about Translational events in prokaryotes.

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