DNA Quantification and Standard Curve in Molecular Biology
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Questions and Answers

What is the primary purpose of determining DNA concentration?

  • To optimize the amounts of other reagents used in experiments (correct)
  • To prepare a DNA sample in a suitable solvent
  • To measure the absorbance of DNA at 260 nanometers
  • To identify potential issues such as degradation, contamination, or insufficient sample material
  • At what wavelength do nucleic acids exhibit characteristic absorbance patterns?

  • 200 nanometers
  • 260 nanometers (correct)
  • 280 nanometers
  • 220 nanometers
  • What is the purpose of performing a blank measurement in the DNA quantification protocol?

  • To identify potential issues in the sample
  • To establish a baseline absorbance value (correct)
  • To measure the DNA concentration
  • To prepare the DNA sample
  • What is the advantage of using a spectrophotometer for DNA quantification?

    <p>It provides a rapid, accurate, and non-destructive means of quantifying DNA</p> Signup and view all the answers

    Why is it essential to ensure the DNA sample is adequately dissolved and free from contaminants?

    <p>To prevent interference with the measurement and ensure accurate results</p> Signup and view all the answers

    What is the primary function of a DNA quantification protocol?

    <p>To determine the concentration of DNA</p> Signup and view all the answers

    What is the purpose of wiping the outside of the cuvette or tube?

    <p>To remove any residual liquid</p> Signup and view all the answers

    Why would you repeat the experiment with a different dilution?

    <p>If the absorbance reading is below 0.1 or above 1.0</p> Signup and view all the answers

    What is the wavelength at which the absorbance reading is taken?

    <p>260 nm</p> Signup and view all the answers

    What is the path length of the cuvette typically used in the experiment?

    <p>1 cm</p> Signup and view all the answers

    What is the unit of measurement for the average extinction coefficient (ϵ) for double-stranded DNA?

    <p>(μg/ml)−1 cm−1</p> Signup and view all the answers

    What is the formula used to calculate the concentration of DNA in the sample?

    <p>A=ϵcl/D</p> Signup and view all the answers

    What is the purpose of measuring the absorbance of the DNA sample at 260 nm and 280 nm?

    <p>To assess the purity of the DNA sample</p> Signup and view all the answers

    What does a ratio of absorbance at 260 nm to 280 nm of around 1.8 indicate?

    <p>Pure DNA</p> Signup and view all the answers

    What is the purpose of constructing a standard curve?

    <p>To model the linear relationship between DNA concentration and absorbance</p> Signup and view all the answers

    What is the equation used to estimate the purity of the DNA sample?

    <p>A260/A280</p> Signup and view all the answers

    What is the purpose of plotting the data points on the graph?

    <p>To visualize the linear relationship between DNA concentration and absorbance</p> Signup and view all the answers

    What is the purpose of measuring the absorbance of the DNA sample at 260 nm and 280 nm after constructing three dilutions?

    <p>To assess the purity of the DNA sample</p> Signup and view all the answers

    What is the purpose of labeling the X and Y axes in the graph?

    <p>To provide a clear and concise representation of the data</p> Signup and view all the answers

    What is the outcome of the DNA quantification protocol?

    <p>A quantification of the DNA sample</p> Signup and view all the answers

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