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E. Long Answer Questions (5 marks each)
19. What is meant by semi conservative replication? How did Meselson and Stahl prove it
experimentally?
20. What does the lac operon consist of? How is the operator switch turned on and off in the
expression of genes in this operon? Explain.
21. State Salient features of genetic code.
22. Describe the process of transcription of mRNA is an eukaryotic cell.
23. Describe the various steps involved in the technique of DNA fingerprinting.
