Pglo Transformation Lab

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The Transformation of Escherichia coli With pGalTM Sayan Martin General Biology II – M4L Dr. Anupam Pradhan September 20, 2015 Lab Partners: Sam Vertus Alyssa Ramlogan Priya Hammonds OBJECTIVE: To develop an understanding of bacterial transformation by plasmid DNA, and determine the transformation efficiency of a bacterial sample. INTRODUCTION: Transformation is an important biological mechanism for generating genetic diversity in the natural world. It is also one of the most used tools used in modern biotechnology. It has allowed for a lot of genetic engineering advances. Scientists can design and build DNA containing genes they want and then transfer these genes…show more content…
coli on LB Source plate), sterile toothpicks, sterile inoculating loop, disposable pipettes, plasmid DNA (pGal), buffers (control and recovery), ice water bath (10 ̊C), hot water bath (37 ̊C and 42 ̊C), agar plates (X-Gal control, and AMP X-Gal). PROCEDURE/OBSERVATIONS: Using a sterile toothpick, 15 colonies were taken from the LB source plate, and mixed in the prepared “–DNA” tube, which contained 1.0ml ice cold CaCl2 solution. 0.5ml of this solution was placed in the “+DNA” tube, which contained 0.1ml of pGalTM. 0.1ml of the control buffer was also placed in the –DNA tube. Both tubes were placed in an ice bath for 10 minutes. They were then placed in a 42 ̊C water bath for 90 seconds. The tubes were immediately returned to the ice bath and incubated for 2 minutes. 0.5ml of the recovery broth was added to each tube, using a pipette. The tubes were gently flicked to mix the solution, and then placed in a 37 ̊C water bath for 30 minutes. The agar plates were labeled (X-Gal Control 1, AMP/X-Gal Control 2, and AMP/X-Gal/pGal). After the recovery period, 0.1ml of the solution in the –DNA tube was transferred to the Control plates. 0.1ml of the +DNA solution was placed on the remaining agar plate. Using separate inocculaing loops, the DNA samples were spread all over the agar plates. The plates were stacked one on top of the other, and placed in a 37 ̊C bacterial incubation oven for one

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