The next day after transforming bacterial cells with the products of a ligation reaction, you discover that the plate used to select for transformants has no colonies at all. Give two reasons for this unfortunate result. Write two sentences or less for each reason.
1. The ligation molecule should maintain an appropriate concentration . If the concentration is high ligation will not be carried out. Thus no colonies will be formed.
2. The cells will not get transformed if the Dna is not ligated. Thus the host will not become competent and will not produce result against selective marker.
3. Colonies will not be formed if the cells are not viable and thereby no transformation will takes place.
The next day after transforming bacterial cells with the products of a ligation reaction, you discover...
Describe the ligation reaction. Discuss the possible products of the ligation reaction. Which ones would you expect to find in your plates? 2. Compare the ligation and control plates. Are the plates different/similar? Why? Are the transformation efficiencies similar or different? Why? What happened to e coli that did not take any the vector? Drug resistance? What is the maximum transformation efficiency that can be expected? How this compares to the trasformation efficiency of your plates? 3. For the the...
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QUESTION 1 When transforming bacterial cells, a researcher is interested in generating bacteria that exogenously express the gene that encodes GFP (green fluorescent protein). After transformation, she finds that no bacteria colonies grew on her selective media. Which of the following best explains the results of her transformation protocol? The concentration of the antibiotics in the selection media was too low, therefore no bacteria grew. Her bacterial cells were not competent so they took up excessive amounts of...
III. You isolate a new species of bacteria that only grows in the Antarctic. A wild type strain of this bacteria can synthesize its own alanine (alat) and its own tryptophan trp' ), both of which are essential amino acids. A mutant strain of the same bacterium cannot synthesize either of those two amino acids (ala trp'). You are interested in the degree of linkage between the ala and the trp genes in this new bacterial species. Fortunately, this species...
You are given a mixed culture of two organisms in a small tube of TSB. These two organisms include a Gram-negative strain (your bacterial strain to identify) and a Gram-positive strain (a contaminant). Your first task is to isolate these organisms which will help you identify which Gram-negative strain you are working with. 1) You inoculate two streak plates on TSA media and MacConkey Agar using aseptic technique. For each medium, state whether the medium is selective, differential, or neither and...
and Lab Exer n this experiment you will evaluate effect of UV light on bacterial growth. UV light affects growth by interfering with DNA, resulting in thymine dimer formation. The dimerization is confined within adjacent thymine residues on same strand (intrastrand ). These dimmer lesions have consequence on DNA functions including interference in DNA replication, transcription etc, so UV exposure of cells can lead to lethal effects for bacterial multiplications. This forms the basis for UV method to control bacterial...
Genetics Yeast Lab
The Awesome Power of Yeast Genetics Pre-lab questions Two weeks ago, you received three unknown yeast strains. One was lys- (it cannot synthesize its own lysine) while the other two were LYS+. Because they were LYS+, they should be sensitive to high levels of aminoadipate (AA) before spontaneous and/or induced mutations occur that may allow some cells to become AA resistant. The two LYS+ strains differ in the rate at which they accumulate mutations. Two weeks ago,...
LAB Genetic Engineering of Bacteria Problem Is it possible to transfer the allele for resistance to the antibiotic ampicillin into a bacterial cell? Objectives After completing this lab, the student will be able to: 1. Demonstrate micropipetting and sterile pipetting techniques for handling and transferring bacteria and plasmid DNA. 2. Maintain sterile conditions for culturing bacterial cells. 3. Inoculate bacteria into flasks, culture tubes, or agar plates. 4. Culture isolated individual colonies from an agar plate to form genetically identical...
Only need help with 5,6,7
and mechanism
FTIR and NMR Spectra After completing a reaction and working up the products, it is still necessary to confirm that the correct product was formed. The most common tools used for this analysis are Fourier Transform Infrared (FTIR) and Nuclear Magnetic Resonance (NMR) spectroscopy. In the virtual laboratory, 'H and C NMR spectra are available. Details on interpreting FTIR and NMR spectra are found in your textbook. Your instructor may or may not...
Short Answer Question of the defense mechanisms that we looked at (rationalization, repression, denial, projection, reaction formation, displacement, and sublimation), which one do you see people doing the most? Please give reasons to support your view. Please be sure to write at least three sentences. (15 points) True / False Please fill in the blank (to the left of each question below) to show whether the following are true or false. Where answers are false, please be sure to correct...
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you please help me with Qs 1-6
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LAB EXERCISE #6: Kirby-Bauer Disk Diffusion Test for Antibiotie Sensitivity Determination The Kirby Bauer Test is an agar diffusion test that is used to determine the effectiveness of antibiotics killing various species of bacteria. Filter paper disks saturated with the antibiotic of interest are placed a Mueller-Hinton agar plate on which bacteria that has been isolated from a clinical sample has been sarcad. The antibiotic then diffuses from the disk...