Cloning Vectors and Transformation Techniques

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App

Questions and Answers

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?

  • 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?

  • 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?

<p>Growth on ampicillin media but not on tetracycline media. (A)</p> Signup and view all the answers

What is typically used as a selectable marker in cloning vectors?

<p>Antibiotic resistance genes. (A)</p> Signup and view all the answers

What happens to recombinant DNA introduced into a host cell with respect to the selectable markers present?

<p>Only transformed cells grow on selective antibiotic media. (A)</p> Signup and view all the answers

What is the first step in the cloning process?

<p>Cutting foreign DNA and vector with the same restriction enzyme. (C)</p> Signup and view all the answers

Which antibiotic resistance gene is NOT typically used in cloning vectors?

<p>Glucose resistance (A)</p> Signup and view all the answers

Signup and view all the answers

Signup and view all the answers

Signup and view all the answers

Flashcards

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

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

Specific sequences within a vector where foreign DNA can be inserted. They are recognized by restriction enzymes, allowing precise insertion.

Transformation

The process of introducing foreign DNA into a host bacterium. Typically, resistance genes serve as markers for this process.

Signup and view all the flashcards

Cloning

The process of creating multiple identical copies of a specific DNA sequence. This involves cutting and pasting the desired DNA into a vector, then introducing the combination to a host cell.

Signup and view all the flashcards

Antibiotic Resistance Selection

This method uses antibiotic resistance genes to differentiate between transformed cells and non-transformed cells. Recombinant cells with foreign DNA inserted will lose resistance to specific antibiotics, allowing identification.

Signup and view all the flashcards

pBR322

A commonly used E. coli cloning vector containing genes for ampicillin and tetracycline resistance, as well as a strong origin of replication. It has multiple restriction sites for inserting foreign DNA.

Signup and view all the flashcards

Recombinant Selection

The process of selecting for cells carrying the recombinant DNA. Only the cells that carrying the desired DNA with the foreign insert can grow in a specific antibiotic medium.

Signup and view all the flashcards

Study Notes

Cloning Vector Features

  • 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.

  • 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.

  • Cloning Sites: The vector needs restriction enzyme recognition sites. Preferably, only a few, single sites are required to insert foreign DNA.

Transformation

  • Procedure: A method for introducing foreign DNA into a host bacterium.

  • Mechanism: Usually, genes encoding antibiotic resistance are commonly used selectable markers.

Cloning Technique

  • Antibiotic Resistance Genes: Use of antibiotic resistance genes for selecting only transformed colonies.

  • 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.

Studying That Suits You

Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

Quiz Team

More Like This

Cloning Vectors Quiz
3 questions

Cloning Vectors Quiz

EntrancingRevelation avatar
EntrancingRevelation
Cloning Vectors
3 questions

Cloning Vectors

EntrancingRevelation avatar
EntrancingRevelation
Cloning Vectors
3 questions

Cloning Vectors

GaloreSphene avatar
GaloreSphene
Cloning Vectors Quiz
8 questions

Cloning Vectors Quiz

SafeBalalaika9485 avatar
SafeBalalaika9485
Use Quizgecko on...
Browser
Browser