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Plasmid DNA Extraction Quiz

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Questions and Answers

What is the purpose of glucose in Solution I of the Alkaline lysis method?

To make the solution isotonic (correct)

To prevent DNases from damaging the plasmid

To denature chromosomal DNA

To increase membrane permeability

What is the role of EDTA in Solution I of the Alkaline lysis method?

Prevent DNases from damaging the plasmid

Chelate divalent metal cations (correct)

Increase membrane permeability

Maintain the pH of the buffer

What does Solution III of the Alkaline lysis method contain?

5M sodium chloride, glacial acetic acid, H2O

5M potassium acetate, glacial acetic acid, H2O (correct)

5M sodium acetate, glacial acetic acid, H2O

5M potassium chloride, glacial acetic acid, H2O

What is the function of Tris.Cl in Solution I of the Alkaline lysis method?

Maintains the pH of the buffer Signup and view all the answers

What is the purpose of Solution II in the Alkaline lysis method?

To lyse the bacterial cells Signup and view all the answers

What is the purpose of 0.2N NaOH in Solution II of the Alkaline lysis method?

To denature the chromosomal and plasmid DNA Signup and view all the answers

What is the role of Tris.Cl in Solution I of the Alkaline lysis method?

To maintain the pH of the buffer Signup and view all the answers

What is the function of SDS in Solution II of the Alkaline lysis method?

To solubilize cell components and denature proteins Signup and view all the answers

What is the purpose of glucose in Solution I of the Alkaline lysis method?

To maintain osmotic balance Signup and view all the answers

What is the function of EDTA in Solution I of the Alkaline lysis method?

To chelate divalent metal cations Signup and view all the answers

Study Notes

Alkaline Lysis Method: Solution I

Glucose is added to Solution I to provide a stabilizing effect on the cell membranes, preventing cell lysis during the initial stages of the process.
EDTA (Ethylenediaminetetraacetic acid) is a chelating agent that binds to magnesium and other divalent cations, disrupting the activity of DNases and preventing DNA degradation.
Tris.Cl (Tris-HCl) is a buffer that helps maintain the pH of the solution, ensuring optimal conditions for the subsequent steps in the process.

Alkaline Lysis Method: Solution II

Solution II contains 0.2N NaOH and 1% SDS, which work together to lyse the cells and release the DNA.
The 0.2N NaOH denatures the cell membranes, allowing the SDS to solubilize the lipids and release the DNA.
SDS (Sodium dodecyl sulfate) is a detergent that disrupts the cell membrane, solubilizing the lipids and releasing the DNA.

Alkaline Lysis Method: Solution III

Solution III contains a high concentration of potassium acetate, which helps to precipitate the SDS, proteins, and other impurities, allowing the DNA to be recovered.

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Description

Test your knowledge of plasmid DNA extraction with the alkaline lysis method in this Lab-5 quiz. Explore the process of isolating bacterial plasmids, their structure, and their role in carrying genetic traits.