Discovering DNA as the Genetic Material Experiments
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Questions and Answers

Why did McLeod and McCarty destroy different macromolecules?

  • To observe the color changes in the macromolecules.
  • To identify the genetic material. (correct)
  • To understand the physical structure of macromolecules.
  • To see which macromolecule is the largest.

    • In Hershey-Chase experiment, why did they use sulfur on protein and phosphate on DNA?

  • To test bacterial resistance to various elements.
  • To determine the radioactivity levels of sulfur and phosphate.
  • To see how bacteria grow in different conditions.
  • To label the protein and DNA for tracking purposes. (correct)

    • What is the chemical basis for base pairing in DNA?

  • Thymine bonds with Adenine due to hydrogen bonding. (correct)
  • Cytosine pairs with Thymine to maintain DNA structure stability.
  • C binds with G because of their opposite charges.
  • G binds with A due to their similar sizes.

    • Why is it important for purines to pair with pyrimidines in DNA?

    <p>To prevent DNA from becoming too thick or too thin.</p> Signup and view all the answers

    What happens if purines bind with themselves according to Chargaff’s rule?

    <p>The DNA strand would be too thick.</p> Signup and view all the answers

    Which form of DNA is described as being narrow, right spun, and the most common in nature?

    <p>B-DNA</p> Signup and view all the answers

    What is the process where RNA copies DNA and converts it to mRNA?

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

    During Griffith's Experiment, why did the mouse die when exposed to the bacteria?

    <p>The bacteria underwent transformation from r-strain to s-strain</p> Signup and view all the answers

    In McLeod and McCarty's Experiment, why did the mouse survive when exposed to the bacteria?

    <p>DNA was destroyed by DNase</p> Signup and view all the answers

    What is one of the main roles of a bacteriophage in the Hershey-Chase Experiment?

    <p>Injecting DNA or RNA into the bacterial cell</p> Signup and view all the answers

    What is the term for the process where bacteriophages cause the bacterial cell to burst and release more phages?

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

    In the Hershey-Chase Experiment, what was found in the pellet fraction after centrifugation?

    <p>$32P$-labeled phages</p> Signup and view all the answers

    Which type of genetic material did the experiment involving tobacco mosaic virus demonstrate can be RNA?

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

    What component of the reconstituted viruses was originally from virus b in the experiment?

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

    Why is RNA more susceptible to degradation in cold temperatures compared to DNA?

    <p>RNA has one strand only</p> Signup and view all the answers

    According to Chargaff's rules, what is the relationship between A and T, and G and C in DNA?

    <p>(A+G) = (C+T)</p> Signup and view all the answers

    What does purines/pyrimidines ratio of 1.00 indicate regarding DNA composition?

    <p>Equal amounts of purines and pyrimidines</p> Signup and view all the answers

    What risk does pairing too many purines or pyrimidines pose to DNA structure according to the text?

    <p>Makes DNA wider than 2 nm</p> Signup and view all the answers

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