Recombinant DNA Technology
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Questions and Answers

What is the key step for incorporating the desired DNA fragment into the vector?

  • Digestion
  • Ligation (correct)
  • Transformation
  • Dephosphorylation
  • What is the purpose of dephosphorylation in DNA cloning?

  • To enhance the transformation efficiency
  • To cleave the vector at specific sites
  • To prevent the vector from self-ligating (correct)
  • To activate the DNA fragment for ligation
  • What is the role of the host organism in DNA cloning?

  • To replicate the recombinant DNA molecule (correct)
  • To act as a source of DNA fragments
  • To facilitate dephosphorylation of DNA fragments
  • To provide the necessary restriction enzymes
  • What is the purpose of digestion in DNA cloning?

    <p>To create complementary sticky ends in the vector and DNA fragment (C)</p> Signup and view all the answers

    What is the role of transformation in DNA cloning?

    <p>To introduce the recombinant DNA molecule into the host cell (C)</p> Signup and view all the answers

    What is the effect of introducing recombinant DNA encoding a protein into a host organism?

    <p>The recombinant protein may not be produced. (D)</p> Signup and view all the answers

    What is the purpose of using ampicillin and tetracycline in the selection of transformed cells?

    <p>To prevent the growth of non-transformed cells. (B)</p> Signup and view all the answers

    Which of the following is NOT a requirement for the expression of foreign proteins in a host organism?

    <p>The use of an antibiotic for cell selection. (C)</p> Signup and view all the answers

    In a transformation experiment, cells that are transformed with a non-recombinant vector will:

    <p>Grow in both ampicillin and tetracycline containing medium. (B)</p> Signup and view all the answers

    What is the process called where a recombinant molecule is analyzed to find clones with desired DNA inserts and biological properties?

    <p>Screening (B)</p> Signup and view all the answers

    What is the purpose of replicating the recombinant molecule inside a host cell?

    <p>To increase the number of copies of the recombinant molecule (D)</p> Signup and view all the answers

    What is the key difference between non-transformed and transformed cells in the context of this experiment?

    <p>Transformed cells can grow in the presence of antibiotics while non-transformed cells cannot. (A)</p> Signup and view all the answers

    After replication, what is the next step in the process?

    <p>Screening (B)</p> Signup and view all the answers

    What is the purpose of selecting recombinant colonies?

    <p>To eliminate colonies that do not contain the recombinant molecule (D)</p> Signup and view all the answers

    Why is it important to express the recombinant DNA?

    <p>To produce the desired protein or other product (A)</p> Signup and view all the answers

    What is the term for the production of multiple copies of a recombinant molecule?

    <p>Replication (D)</p> Signup and view all the answers

    What is the purpose of analyzing the recombinant molecule?

    <p>To confirm that the DNA insert is present in the recombinant molecule (B)</p> Signup and view all the answers

    What is the relationship between the process of screening and the process of expression?

    <p>Screening identifies colonies that express the recombinant DNA (D)</p> Signup and view all the answers

    Which vector is most suitable for cloning and expressing genes in mammalian cells?

    <p>SV40 (C)</p> Signup and view all the answers

    What is the main characteristic of a shuttle vector?

    <p>It can replicate in multiple host organisms (A)</p> Signup and view all the answers

    Which of these vectors is a viral vector?

    <p>Baculovirus (A), SV40 (C), λgt11 (D)</p> Signup and view all the answers

    Which vector is commonly used for large-scale protein production?

    <p>Baculovirus (B)</p> Signup and view all the answers

    Which vector is used to produce recombinant proteins in E. coli?

    <p>λgt11 (D)</p> Signup and view all the answers

    Why is it important to use a vector with an origin of replication?

    <p>To allow the vector to replicate independently of the host genome (B)</p> Signup and view all the answers

    What is the purpose of using restriction enzymes in cloning?

    <p>To create a single, specific cut in the DNA sequence (C)</p> Signup and view all the answers

    What is the role of a promoter in a vector?

    <p>To control the expression of cloned genes (C)</p> Signup and view all the answers

    What is the main advantage of using a baculovirus as a vector for protein expression?

    <p>It can produce high yields of proteins (A)</p> Signup and view all the answers

    Which of these factors does NOT influence the choice of a vector for cloning?

    <p>The DNA sequence of the insert (D)</p> Signup and view all the answers

    What is the primary function of DNA sequencing?

    <p>To determine the linear order of nucleotide bases in DNA (C)</p> Signup and view all the answers

    What is the significance of the introduction of recombinant DNA technology in the development DNA sequencing?

    <p>Recombinant DNA technology provided the means to isolate and amplify specific DNA fragments, making sequencing more efficient and accurate. (A)</p> Signup and view all the answers

    How does recombinant DNA technology impact gene expression?

    <p>All of the above (D)</p> Signup and view all the answers

    What is the effect of a recombinant DNA fragment containing an active promoter being located next to a previously silent host cell gene?

    <p>The host cell gene is activated and starts expressing its protein. (B)</p> Signup and view all the answers

    How does insertional inactivation affect gene expression?

    <p>It disrupts the function of a gene involved in regulating gene expression. (C)</p> Signup and view all the answers

    When did the development of rapid and efficient methods for DNA sequencing first take place?

    <p>Mid 1970s (C)</p> Signup and view all the answers

    What is the fundamental principle underlying DNA sequencing?

    <p>The determination of the linear order of nucleotide bases in DNA (A)</p> Signup and view all the answers

    What is the significance of the linear order of nucleotide bases in DNA?

    <p>It encodes the genetic information for an organism (D)</p> Signup and view all the answers

    When was the first human hormone produced by recombinant DNA technology?

    <p>1978 (D)</p> Signup and view all the answers

    Recombinant DNA technology is used to create what type of DNA?

    <p>Artificially created DNA (D)</p> Signup and view all the answers

    What is a key property of plasmids that contributes to their use as vectors in recombinant DNA?

    <p>All of the above. (D)</p> Signup and view all the answers

    What are the two main components involved in constructing recombinant DNA?

    <p>A foreign DNA fragment and a plasmid vector (C)</p> Signup and view all the answers

    What happens to the gene in the plasmid when a foreign DNA fragment is inserted?

    <p>The foreign DNA fragment disrupts the expression of the gene. (C)</p> Signup and view all the answers

    What does the term "DNA cloning" refer to?

    <p>Producing multiple identical copies of a specific DNA fragment. (A)</p> Signup and view all the answers

    What role do restriction enzymes play in recombinant DNA technology?

    <p>They cleave DNA at specific sequences, creating fragments suitable for recombination. (C)</p> Signup and view all the answers

    What is the primary function of DNA ligase in the context of recombinant DNA technology?

    <p>To join two DNA fragments together, creating a phosphodiester bond. (D)</p> Signup and view all the answers

    What is meant by the term "chimeric DNA"?

    <p>A DNA molecule containing sequences from multiple distinct sources. (B)</p> Signup and view all the answers

    What is one of the main advantages of using recombinant DNA technology to produce insulin?

    <p>All of the above. (D)</p> Signup and view all the answers

    What is the characteristic property of EcoRI restriction enzyme?

    <p>It recognizes a specific sequence of nucleotides and cuts the DNA at a specific site. (A)</p> Signup and view all the answers

    What type of ends are produced by HaeIII restriction enzyme?

    <p>Blunt ends, which have no overhangs. (A)</p> Signup and view all the answers

    What is the key aspect of DNA ligase's function?

    <p>It joins two compatible ends of DNA fragments, creating a phosphodiester bond. (A)</p> Signup and view all the answers

    What was the first event that led to the creation of recombinant DNA?

    <p>The use of DNA ligase to join two DNA fragments. (B)</p> Signup and view all the answers

    What type of bond does DNA ligase form to join two pieces of DNA?

    <p>Phosphodiester bond (D)</p> Signup and view all the answers

    Which of these statements BEST describes the impact of the Asilomar Conference on recombinant DNA technology?

    <p>It stimulated discussion and development of guidelines for responsible use of recombinant DNA technology. (B)</p> Signup and view all the answers

    Flashcards

    Cloning Vector

    A DNA molecule used to carry foreign DNA into a host cell.

    DNA Fragment

    A specific piece of DNA that is to be cloned.

    Ligation

    The process of joining two DNA fragments together using ligase enzyme.

    Transformation

    The introduction of recombinant DNA into a host organism.

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    Selection of Recombinant DNA

    Identifying host organisms that successfully incorporated the recombinant DNA.

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    Recombinant DNA

    DNA that has been artificially formed by combining constituents from different organisms.

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    Host cell

    A cell that supports the replication of a recombinant molecule.

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    Recombinant colony

    A group of cells that have successfully taken up recombinant DNA.

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    Screening for clones

    The process of identifying cells that contain desired recombinant DNA.

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    DNA insert

    A segment of DNA introduced into a host organism's genome.

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    Expression of recombinant DNA

    The process by which the inserted DNA is transcribed and translated into proteins.

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    Molecule analysis

    The examination of recombinant molecules to verify their properties and functionality.

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    Replication

    The process by which recombinant DNA is copied within a host cell.

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    Recombinant DNA Expression

    The process where foreign DNA is expressed in living cells to produce proteins.

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    Transformed Colonies

    Colonies of bacteria that have successfully incorporated recombinant DNA and can grow in selective media.

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    Selective Media

    Growth medium containing antibiotics like ampicillin or tetracycline to identify transformed organisms.

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    Expression Vectors

    Specialized plasmids used to promote high levels of protein production from foreign DNA.

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    Recombinant Protein Production

    The process of creating proteins from introduced recombinant DNA within host organisms.

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    Recombinant DNA Technology

    A method of combining DNA from different sources to create new genetic sequences.

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    Cohen & Boyer

    Researchers who first produced a recombinant DNA molecule, awarded the Nobel Prize in Chemistry in 1980.

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    DNA Cloning

    The process of making identical copies of a specific DNA fragment.

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    Plasmid

    A small circular DNA molecule within bacteria that can replicate independently.

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    Restriction Enzyme

    An enzyme that cuts DNA at specific nucleotide sequences to facilitate cloning.

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    Blunt Ends

    DNA fragments with no overhangs, cut straight across by restriction enzymes.

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    Cohesive Ends

    DNA fragments with short overhangs, allowing them to stick together.

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    Gene Cloning

    Making multiple identical copies of a specific gene.

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    DNA Ligase

    An enzyme that joins two pieces of DNA together by forming phosphodiester bonds.

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    Nobel Prize in Chemistry 1980

    Award given to Cohen and Boyer for their work on recombinant DNA.

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    Asilomar Conference

    A 1975 meeting that established guidelines for recombinant DNA research.

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    First Human Hormone from rDNA

    In 1978, the first human hormone (insulin) produced using recombinant DNA technology.

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    Antibiotic Resistance Genes

    Genes often carried by plasmids that confer resistance to antibiotics.

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    Chimeric DNA

    DNA formed from genetic material of two different species.

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    Genetic Recombination

    The process of combining genetic material from multiple sources to create new DNA sequences.

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    Molecular Cloning Vector

    A tool used to insert foreign DNA into a host organism for replication.

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    YEp24

    A shuttle vector that can replicate in E. coli and Saccharomyces cerevisiae.

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    Viral Vector

    Vectors derived from viruses designed to infect host cells for gene expression.

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    λgt11

    An expression vector derived from bacteriophage λ, used for gene cloning in E. coli.

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    SV40

    A virus that infects mammalian cells, used as a vector for gene cloning.

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    Baculovirus

    A viral vector that infects insect cells for high protein expression.

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    Cloning Steps

    The protocol involves digesting DNA, using vectors, and inserting foreign genes.

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    Foreign DNA

    DNA that is introduced into a host organism for cloning or expression.

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    Active Promoter

    A region of DNA that initiates transcription of a gene.

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    Insertional Inactivation

    Disruption of a gene's expression by inserting foreign DNA.

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    Silent Gene

    A gene that is not expressed or is inactive in a certain condition.

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    DNA Sequencing

    The process of determining the order of nucleotides in DNA.

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    Nucleotide Bases

    The building blocks of DNA; adenine, thymine, cytosine, guanine.

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    DNA Sequencing History

    The development of methods to sequence DNA began in the 1970s.

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    Study Notes

    Recombinant DNA Technology

    • Recombinant DNA is artificially created DNA, combining two or more sequences not normally found together
    • Recombinant DNA technology joins DNA molecules from different species, creating new genetic combinations for science, medicine, agriculture, and industry
    • Recombinant organisms have a different combination of alleles compared to their parents

    Recombinant DNA

    • A recombinant organism is an organism whose DNA consists of a different combination of alleles compared to either of its parents
    • A recombinant virus is a virus formed by combining genetic material
    • Recombinant DNA is an artificial form of DNA

    Recombinant DNA Technology

    • Scientists use restriction enzymes to cut DNA from different species at specific sites, and then fuse the cut strands together
    • The first recombinant DNA molecules were produced in 1972
    • The first publications on recombinant DNA technology were in 1972 and 1973

    Important Events in Recombinant DNA Technology

    • 1972: DNA ligase joined two fragments, creating the first recombinant DNA molecules
    • 1973: Concerns arose about the potential hazards of recombinant DNA technology
    • 1974: A global moratorium on some recombinant experiments was implemented
    • 1975: Guidelines for recombinant DNA technology were developed at the Asilomar Conference
    • 1978: The first human hormone (insulin) was produced using recombinant DNA technology
    • 1980: The first patent for recombinant DNA technology was granted to Stanley N. Cohen and Herbert Boyer

    Bacterial DNA

    • Most bacteria have one circular chromosome ranging from 1,000 to 8,000 kilobase pairs
    • Plasmids are extra-chromosomal genetic elements, also circular DNA molecules
    • A bacterium's complete genome includes the chromosome and plasmids

    Plasmids

    • Plasmids replicate autonomously within a host
    • They often carry genes for resistance to antibiotics (e.g., tetracycline, ampicillin, kanamycin)
    • These marker genes are used to identify cells containing the plasmids

    Recombinant DNA Technology

    • Recombinant DNA molecules are formed by combining genetic material from multiple sources using laboratory methods of genetic recombination (like molecular cloning)
    • The chemical structure of DNA is the same across all organisms; the difference lies in the nucleotide sequences

    Gene Cloning

    • A clone is a collection of identical molecules or cells
    • Cloning a gene means creating many copies of it, often by replication in bacteria
    • Recombinant DNA technology enables gene manipulation

    Restriction Enzymes

    • Restriction enzymes (endonucleases) cut DNA at specific nucleotide sequences
    • They produce blunt or sticky ends (cohesive ends)
    • Blunt ends have no overhangs, sticky ends have overhangs

    DNA Ligase

    • DNA ligase joins two DNA pieces, catalyzing phosphodiester bond formation
    • It works with both blunt and sticky ends, joining double-stranded DNA

    Cloning Vectors

    • Cloning vectors are DNA molecules that replicate inside living cells (often derived from plasmids or viruses)
    • They contain genetic signals for replication, elements for inserting foreign DNA, and elements to identify cells with recombinant DNA

    Standard Cloning Protocols

    • Choosing a host organism and cloning vector
    • Preparing vector DNA
    • Preparing the DNA to be cloned (DNA insert)
    • Creating recombinant DNA
    • Introducing recombinant DNA into host organisms
    • Selecting organisms with recombinant DNA
    • Screening clones for desired DNA inserts and biological properties

    Selection of Recombinant Colonies

    • Colonies are selected based on antibiotic resistance associated with antibiotic-containing media

    Expression of Recombinant DNA

    • Recombinant DNA constructs are able to be expressed in living cells, resulting in recombinant proteins
    • Recombinant protein production requires specialized expression vectors.

    Polymerase Chain Reaction (PCR)

    • A technique that amplifies DNA from very little starting material
    • PCR is a critical tool in recombinant DNA technology allowing the amplification of DNA from minute or degraded samples

    Insertional Inactivation

    • Insertional inactivation occurs when recombinant DNA disrupts a gene, rendering it nonfunctional
    • This disruption can result from insertion into a gene's coding sequence

    DNA Sequencing

    • DNA sequencing determines the order of nucleotide bases in a DNA fragment
    • The Sanger method (chain termination method) is widely used, and has been largely automated for faster, more efficient analysis.

    Applications of Recombinant DNA

    • Forensics, medicine, agriculture, industry

    Recombinant Chymosin

    • An enzyme used in cheese production
    • Genetically engineered chymosin is now commonly used to make cheese in industry today

    Zebra Fish

    • Zebra fish have been genetically modified to detect pollution

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    Description

    Test your knowledge on the fundamentals of recombinant DNA technology, including its creation, applications, and historical developments. This quiz covers key concepts such as recombinant organisms, DNA manipulation techniques, and significant milestones in the field.

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