1.

In a class room seminar on cloning vectors, your friend asked to explain the steps to introduce the plasmid DNA to a bacteria cell, Microinjection and bilestics. Answer his questions.

Answer»

For this, bacterial cells must first be made ‘competent’ to take up DNA. This is done by treating them with a specific concentration of a divalent cation, such as calcium, Recombinant DNA can then be forced into such cells by incubating the cells with recombinant DNA on ice, followed by placing them briefly at 42°C (heat shock), and then putting them back on ice. This helps to introduce the plasmid DNA into bacterial cell.

Microinjection – In this recombinant DNA is directly injected into the nucleus of an animal cell. Biolistics – In this cells are bombarded with high velocity microparticles of gold or tungsten coated with DNA



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