Polymerase Chain Reaction Techniques Quiz
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Questions and Answers

What is the purpose of the polymerase chain reaction (PCR)?

  • To rapidly analyze ancient samples of DNA
  • To amplify the size of DNA
  • To identify infectious agents
  • To rapidly make millions to billions of copies of a specific DNA sample (correct)
  • At what temperature is the denaturation of dsDNA template performed in PCR?

  • 80–85°C
  • 50–70°C
  • 92–95°C (correct)
  • 72°C
  • What is the function of Deoxynucleoside triphosphates (dNTPs) in PCR?

  • To act as primers for DNA replication
  • To serve as energy sources for DNA synthesis (correct)
  • To regulate the pH of the buffer
  • To stabilize the DNA polymerase
  • Which chemical component of PCR is responsible for reducing the energy barrier during DNA synthesis?

    <p>MgCl2</p> Signup and view all the answers

    What is the main function of thermostable DNA polymerase in PCR?

    <p>To add nucleotides to the growing DNA strand</p> Signup and view all the answers

    What is the purpose of PCR primers in the polymerase chain reaction (PCR)?

    <p>To initiate DNA synthesis in PCR by matching the sequences at the ends of or within the target DNA</p> Signup and view all the answers

    What is the purpose of the denaturation step in PCR?

    <p>To disrupt the hydrogen bonds between complementary bases, yielding single-stranded DNA molecules</p> Signup and view all the answers

    What is the function of Multiplex PCR?

    <p>To produce amplicons of varying sizes that are specific to different DNA sequences</p> Signup and view all the answers

    What is the purpose of the extension/elongation step in PCR?

    <p>To synthesize a new DNA strand complementary to the DNA template strand by adding dNTPs in 3' to 5' direction</p> Signup and view all the answers

    What is the significance of the initialization step in PCR?

    <p>It heats the reaction to a temperature required for heat activation of DNA polymerases</p> Signup and view all the answers

    PCR is a method used to make millions to billions of copies of a specific RNA sample.

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

    PCR is not commonly used in medical laboratory research for applications in biomedical research and criminal forensics.

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

    The denaturation of dsDNA template in PCR is performed at approximately 100°C.

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

    PCR does not involve amplifying copies of very small amounts of DNA sequences in a series of cycles of temperature changes.

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

    PCR primers are not one of the chemical components of PCR.

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

    During the denaturation step in PCR, hydrogen bonds between complementary bases are strengthened, leading to the formation of double-stranded DNA molecules.

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

    Hot-start PCR is initiated at a temperature of 94–96 °C to activate extremely thermostable polymerases.

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

    Multiplex PCR involves amplifying only a single DNA sequence at a time to produce amplicons of varying sizes.

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

    The annealing step in PCR involves lowering the reaction temperature to 70–75 °C for 30–40 seconds.

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

    Touchdown PCR is a type of PCR that initially has a high annealing temperature which is gradually decreased in subsequent cycles.

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

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