What precautions would you take in competent cells formation and transformation of competent cells with recombinant...
What precautions would you take in competent cells formation and transformation of competent cells with recombinant plasmid DNA
Homework Answers
Precautions taken during transformation-
- The transformation is effective when <10ng of DNA is used. PUC19 DNA suitable as control.
- Supercoiled DNA is most efficient for transformation compared to linear or single stranded DNA
- In electroporation, presence of salts might lower transformation efficiency. Limit the
- volume of plasmid DNA to 1L per transformation
- Column-purified DNA might be good choice
- Ligation mixtures inhibit transformation. ligases must be heat
- inactivated before the mixture is added to the cells.
Heat shock -
- 42°C for 45 seconds for PCR tubes or thin-walled tubes
- . 37°C for 60 seconds for microfuge tubes or thick-walled tubes
- General set up: 37°C for 60 seconds
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What
precautions would you take in competent cells formation and
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4. You have prepared a batch of competent E coli cells and found its transformation efficiency...
4. You have prepared a batch of competent E coli cells and found its transformation efficiency is 106 per μg plasmid DNA. A professional scientists prepared competent E. coli cells having a transformation efficiency of about 108 cells/ g plasmid DNA Calculate % score of your E. coli transformation efficiency (Τ.Ε.).
Which statement about gene cloning is false? A. Bacterial cells take up recombinant plasmids by transformation....
Which statement about gene cloning is false? A. Bacterial cells take up recombinant plasmids by transformation. B. Recombinant DNA molecules usually contain a DNA fragment inserted into a bacterial vector. C. To insert a gene of interest into a vector, the gene of interest and the vector must be digested with different restriction enzymes D. Transformed bacteria are plated onto media containing the appropriate antibiotic and only bacteria containing the plasmid with antibiotic resistance will grow.
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Sub-cloning is a powerful technique that involves the preparation of a recombinant plasmid containing a DNA fragment of interest and subsequent transformation that plasmid. In this experiment, you preformed a transformation, but the recombinant plasmid containing phage DNA was already prepared. Describe how you would make a recombinant plasmid containing a fragment you have already generated by PCR , including what enzymes you would use and the approximate length of time each step would take.
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1. Fill in the table above with what you observe on your plates. 2. Bacterial transformation...
1. Fill in the table above with what you observe on your
plates.
2. Bacterial transformation occurred on which agar plate (s)?
What evidence do you have that the bacteria were transformed
here?
3. Which plates have glowing growth? Explain what causes
bacteria to glow.
II. Transformation of E. coli with Plasmid DNA (PGLO) 1. Three LB (Luria Broth) agar plates are obtained. The plates contain: • Plate A: LB-Agar/Ampicillin/Arabinose • Plate B: LB-Agar/Ampicillin • Plate C: LB-Agar 2. Three...
You add (1.04x10^0) ng of plasmid DNA in 50 µL to 100 µL of competent E....
You add (1.04x10^0) ng of plasmid DNA in 50 µL to 100 µL of competent E. coli cells and incubate the mixture on ice for 20 min. Following a heat-shock treatment, the cells are incubated at 37 C for 30 min. At the end of the incubation you spread (1.2000x10^2) µL of the transformation mix on an agar plate and incubate the plate overnight at 37 C. The next morning you observe (6.8400x10^2) colonies on the plate, each colony having...
The Griffith's experiment used cells that were naturally competent, that is, able to take up DNA...
The Griffith's experiment used cells that were naturally competent, that is, able to take up DNA from the environment without any experimental manipulation. What would you expect his results to be if he had NOT used naturally competent bacterial species? Select one: a. Mice in the R strain plus heat-killed S strain treatment would die b. Mice in the R strain only treatment would die c. No S strain bacteria would be present in any treatment d. Mice in the...
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explain briefly about Inoue’s transformation buffer and its role in making competent cells?
explain briefly about Inoue’s transformation buffer and its role in making competent cells?
Please classify each statement as describing transformation, conjugation, or transduction in bacteria. Bacteria can acquire plasmids...
Please classify each statement as describing transformation, conjugation, or transduction in bacteria. Bacteria can acquire plasmids from outside the cell. A bacterium that contains an F plasmid connects to a recipient bacterium that lacks an F plasmid with an appendage called a pilus, through which the plasmid is transferred. Some bacterial DNA fragments may be included when new phage particles are assembled. A cell can be treated to make it competent to take up DNA from its environment. When a...
4. You have prepared a batch of competent E coli cells and found its transformation efficiency is 106 per μg plasmid DNA. A professional scientists prepared competent E. coli cells having a transformation efficiency of about 108 cells/ g plasmid DNA Calculate % score of your E. coli transformation efficiency (Τ.Ε.).
1. Fill in the table above with what you observe on your
plates.
2. Bacterial transformation occurred on which agar plate (s)?
What evidence do you have that the bacteria were transformed
here?
3. Which plates have glowing growth? Explain what causes
bacteria to glow.
II. Transformation of E. coli with Plasmid DNA (PGLO) 1. Three LB (Luria Broth) agar plates are obtained. The plates contain: • Plate A: LB-Agar/Ampicillin/Arabinose • Plate B: LB-Agar/Ampicillin • Plate C: LB-Agar 2. Three...
Please classify each statement as describing transformation, conjugation, or transduction in bacteria. Bacteria can acquire plasmids from outside the cell. A bacterium that contains an F plasmid connects to a recipient bacterium that lacks an F plasmid with an appendage called a pilus, through which the plasmid is transferred. Some bacterial DNA fragments may be included when new phage particles are assembled. A cell can be treated to make it competent to take up DNA from its environment. When a...
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