PCR Steps: Primer Binding and Extension
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Questions and Answers

What is the optimal temperature for the DNA polymerase enzyme to synthesize new DNA strands during the extension step of PCR?

  • 72°C (correct)
  • 95°C
  • 85°C
  • 65°C

What is the primary function of primers in PCR?

  • To provide a starting point for DNA synthesis (correct)
  • To break down glucose for energy and carbon molecules
  • To provide energy for DNA synthesis
  • To catalyze the sixth step of glycolysis

What is the typical length range of PCR primers?

  • 50 to 60 nucleotides
  • 10 to 15 nucleotides
  • 30 to 40 nucleotides
  • 18 to 25 nucleotides (correct)

What is the significance of primer specificity in PCR?

<p>It ensures that the primer anneals specifically to the target DNA sequence (B)</p> Signup and view all the answers

What is the name of the enzyme that catalyzes the sixth step of glycolysis and is being targeted for amplification in this experiment?

<p>Glyceraldehyde 3-phosphate dehydrogenase (GAPDH) (C)</p> Signup and view all the answers

What is the primary purpose of the denaturation step in PCR?

<p>To separate the double-stranded DNA into two single strands (C)</p> Signup and view all the answers

What is the optimal temperature range for the annealing step in PCR?

<p>50-60°C (C)</p> Signup and view all the answers

What is the primary characteristic of Taq polymerase that makes it suitable for PCR?

<p>Thermophilic nature (A)</p> Signup and view all the answers

What is the limitation of PCR in terms of DNA fragment length?

<p>PCR can only amplify DNA fragments up to 10 kb (D)</p> Signup and view all the answers

What is the ideal GC content range for PCR primers?

<p>50-55% (D)</p> Signup and view all the answers

What is the role of dNTPs in DNA synthesis during PCR?

<p>To provide the building blocks for DNA synthesis (A)</p> Signup and view all the answers

What is the consequence of significant self-complementarity in PCR primers?

<p>Primer-dimer formation and non-specific binding (B)</p> Signup and view all the answers

Which of the following is an application of PCR in genetic engineering?

<p>Site-directed mutagenesis (B)</p> Signup and view all the answers

What is the role of deoxyribonucleotide triphosphates (dNTPs) in PCR?

<p>Serving as building blocks for DNA synthesis (A)</p> Signup and view all the answers

What is the purpose of optimizing the melting temperature (Tm) of PCR primers?

<p>To promote similar annealing temperatures (D)</p> Signup and view all the answers

What is the characteristic of Taq polymerase that allows it to withstand repeated heating cycles during PCR?

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

What is the primary advantage of Taq polymerase's high error rate in certain applications?

<p>Generation of genetic diversity (A)</p> Signup and view all the answers

What is the typical length range limitation of DNA fragments that can be amplified using Taq polymerase?

<p>Up to a few kilobases (D)</p> Signup and view all the answers

What is the direction in which Taq polymerase adds nucleotides to the growing DNA strand during PCR?

<p>5' to 3' (D)</p> Signup and view all the answers

Why is Taq polymerase widely used in molecular biology laboratories?

<p>It is commercially available in purified form (C)</p> Signup and view all the answers

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