Gel Electrophoresis Method
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Questions and Answers

What is the primary purpose of gel electrophoresis?

  • To separate DNA fragments based on size (correct)
  • To label nucleotides with fluorescent dyes
  • To amplify DNA sequences
  • To create recombinant DNA

    • Which factor primarily affects the movement speed of DNA fragments in gel electrophoresis?

  • The type of gel used
  • The size of the DNA fragments (correct)
  • The length of time the voltage is applied
  • The charge of the DNA fragment

    • What role do primers play in the Polymerase Chain Reaction (PCR)?

  • To separate the DNA strands
  • To label the DNA fragments for sequencing
  • To bind to the template and initiate DNA synthesis (correct)
  • To amplify multiple DNA sequences simultaneously

    • What is the primary function of restriction endonuclease enzymes in recombinant DNA technology?

    <p>To cut DNA at specific nucleotide sequences</p> Signup and view all the answers

    During DNA sequencing, what is the function of the labeled nucleotide bases?

    <p>To identify and visualize DNA fragments</p> Signup and view all the answers

    How do plasmids aid in gene transformation within bacteria?

    <p>They contain unique genetic markers and replication origins</p> Signup and view all the answers

    What role do sticky ends play during the transformation process?

    <p>They prepare bases for pairing with foreign DNA</p> Signup and view all the answers

    How does PCR contribute to disease detection?

    <p>By amplifying specific DNA sequences from samples</p> Signup and view all the answers

    What is the main difference between DNA splicing and DNA sequencing?

    <p>DNA splicing creates new DNA molecules; sequencing provides identity of existing strands.</p> Signup and view all the answers

    What is the purpose of the Polymerase Chain Reaction (PCR)?

    <p>To amplify specific segments of DNA</p> Signup and view all the answers

    Which statement accurately describes the functions of genetic markers in plasmids?

    <p>They help distinguish transformed bacteria from non-transformed</p> Signup and view all the answers

    In gel electrophoresis, what property of DNA causes it to move toward the positive end?

    <p>The negative charge of the DNA molecules</p> Signup and view all the answers

    What is the first step in the Polymerase Chain Reaction (PCR)?

    <p>Heating the DNA to separate its strands</p> Signup and view all the answers

    What is a common application of recombinant DNA technology?

    <p>The creation of genetically modified organisms</p> Signup and view all the answers

    What is the significance of vectors in the transformation of DNA?

    <p>They transport and replicate foreign DNA within host cells</p> Signup and view all the answers

    Which statement is true regarding the continuous heating and cooling process used in PCR?

    <p>It enables the formation of new DNA strands</p> Signup and view all the answers

    What is the purpose of restriction enzymes in recombinant DNA technology?

    <p>To cut DNA at specific sequences</p> Signup and view all the answers

    In the process of transformation using vectors, what is the main function of the vector?

    <p>To carry DNA into a host cell</p> Signup and view all the answers

    Which of the following describes the Polymerase Chain Reaction (PCR)?

    <p>A technique for creating multiple copies of DNA in vitro</p> Signup and view all the answers

    What does DNA sequencing determine?

    <p>The order of nucleotides in a DNA molecule</p> Signup and view all the answers

    Which step is involved in synthesizing polypeptides based on mRNA sequence during protein synthesis?

    <p>Translation</p> Signup and view all the answers

    What is a key feature of recombinant DNA technologies?

    <p>It requires the use of heat shock to introduce plasmids into bacteria</p> Signup and view all the answers

    What is a potential outcome of DNA manipulation using genetic engineering?

    <p>The enhancement of specific traits in organisms</p> Signup and view all the answers

    Which term refers to changes in the DNA sequence that may occur during cell division?

    <p>Mutations</p> Signup and view all the answers

    Study Notes

    Gel Electrophoresis

    • Method for separating DNA fragments based on size using a porous gel and electric voltage.
    • Negatively charged DNA moves towards the positive electrode; smaller fragments migrate faster.
    • Applications include DNA characterization, fingerprinting, genomic comparisons, and gene identification.

    DNA Splicing

    • Technique used to determine the identity and sequence of nucleotides in DNA.
    • Involves creating complementary DNA strands using an enzyme and an original DNA template.
    • Fluorescently labeled nucleotide bases are added to allow for visualization of specific sequences.

    Polymerase Chain Reaction (PCR)

    • Aiming to amplify specific DNA sequences, crucial for disease detection.
    • Process involves heating DNA to separate strands and cooling to allow primers to bind.
    • Short primers initiate DNA polymerization, leading to the formation of millions of copies through repeated cycles of heating and cooling.

    Recombinant DNA Technology

    • Techniques for creating recombinant DNA include transformation with vectors, vectorless gene transfer, and transduction.

    Transformation Using a Vector

    • Recombinant DNA creation involves using vectors, such as plasmids in bacteria, to transfer foreign DNA.
    • Plasmids serve two main purposes: they provide a replication origin for inserted DNA and contain genetic markers for identification, such as antibiotic resistance.

    Role of Restriction Enzymes

    • Restriction enzymes cut DNA at specific sequences, creating sticky ends for new DNA to attach.
    • Sticky ends facilitate the pairing of complementary DNA bases for successful gene insertion.

    Genetic Vocabulary

    • Replication: The biological process of duplicating a polynucleotide strand.
    • Mutations: Changes in DNA sequences occurring during cell division.
    • In Vitro Amplification: The technique of producing multiple copies of a specific DNA region in a laboratory setting.
    • Translation: The step in protein synthesis where mRNA directs the formation of polypeptides by decoding genetic instructions.
    • Anticodon: A trinucleotide sequence on tRNA that is complementary to a codon on mRNA.
    • Autosome: Any chromosome that is not a sex chromosome.
    • Gene Interaction: The interplay between different genes affecting phenotypic outcomes.

    Summary of Genetic Engineering

    • Process of modifying organism genes for practical applications by combining DNA from various sources, known as DNA recombination.

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    Related Documents

    GENBIO2_Q1_Wk-1.pptx

    Description

    This quiz covers the process of gel electrophoresis, a technique used to separate DNA fragments based on their size. You'll explore how an electric voltage is applied to a gel to move negatively charged DNA towards a positive end, with smaller fragments traveling faster. Test your understanding of this essential method in DNA analysis.

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