Podcast
Questions and Answers
What is the role of the origin of replication (ori) in a cloning vector?
What is the role of the origin of replication (ori) in a cloning vector?
- It initiates replication within the host cell. (correct)
- It helps eliminate non-transformed cells.
- It provides the recognition sites for restriction enzymes.
- It determines the antibiotic resistance of the vector.
Which feature is essential for identifying transformed cells during the transformation process?
Which feature is essential for identifying transformed cells during the transformation process?
- Selectable marker (correct)
- Cloning sites
- Origin of replication
- Restriction enzyme recognition sites
Why is it important for a cloning vector to have specific and few restriction enzyme recognition sites?
Why is it important for a cloning vector to have specific and few restriction enzyme recognition sites?
- To avoid complications in cloning by generating multiple fragments. (correct)
- To facilitate the transformation process.
- To increase the size of the foreign DNA.
- To enhance antibiotic resistance.
In the case of using the cloning vector pBR322, what allows for the identification of recombinant bacteria?
In the case of using the cloning vector pBR322, what allows for the identification of recombinant bacteria?
What is typically used as a selectable marker in cloning vectors?
What is typically used as a selectable marker in cloning vectors?
What happens to recombinant DNA introduced into a host cell with respect to the selectable markers present?
What happens to recombinant DNA introduced into a host cell with respect to the selectable markers present?
What is the first step in the cloning process?
What is the first step in the cloning process?
Which antibiotic resistance gene is NOT typically used in cloning vectors?
Which antibiotic resistance gene is NOT typically used in cloning vectors?
Flashcards
Origin of Replication (ori)
Origin of Replication (ori)
A DNA sequence that initiates replication within a host cell. It controls the number of copies of the target DNA. A strong origin of replication will result in many copies.
Selectable Marker
Selectable Marker
A gene that confers resistance to a specific antibiotic, allowing identification and selection of transformed cells. It helps distinguish between cells that have taken up foreign DNA and those that haven't.
Cloning Sites
Cloning Sites
Specific sequences within a vector where foreign DNA can be inserted. They are recognized by restriction enzymes, allowing precise insertion.
Transformation
Transformation
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Cloning
Cloning
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Antibiotic Resistance Selection
Antibiotic Resistance Selection
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pBR322
pBR322
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Recombinant Selection
Recombinant Selection
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Study Notes
Cloning Vector Features
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Origin of Replication (ori): A sequence where DNA replication begins. A crucial feature for making many copies of the target DNA within a host cell.
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Selectable Marker: A gene that helps distinguish transformed cells (those that have taken up the DNA) from non-transformed ones. This allows for selective growth of the transformed cells.
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Cloning Sites: The vector needs restriction enzyme recognition sites. Preferably, only a few, single sites are required to insert foreign DNA.
Transformation
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Procedure: A method for introducing foreign DNA into a host bacterium.
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Mechanism: Usually, genes encoding antibiotic resistance are commonly used selectable markers.
Cloning Technique
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Antibiotic Resistance Genes: Use of antibiotic resistance genes for selecting only transformed colonies.
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Example: Researchers might use two antibiotics (such as ampicillin and tetracycline) in the process. Recombinant plasmids (containing the foreign DNA) will lose the tetracycline resistance gene due to the insertion of foreign DNA. The transformants will grow only on ampicillin medium. Non-recombinants will grow in media containing both antibiotics. This allows for selection of the clones with the target foreign DNA fragment.
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