DNA Double-Helix Structure Quiz
18 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the backbone of the double-helix structure of DNA made of?

  • Polypeptides
  • Sugar-phosphate (correct)
  • Nucleotides
  • Amino acids

    • How are the two polynucleotide chains in DNA arranged with respect to polarity?

  • Parallel
  • Orthogonal
  • Antiparallel (correct)
  • Complementary

    • What type of bonds pair the bases in the two strands of DNA?

  • Peptide bonds
  • Ionic bonds
  • Covalent bonds
  • Hydrogen bonds (correct)

    • Which of the following nucleotide base pairs with Thymine in DNA?

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

    In the double helix structure of DNA, what is the approximate distance between each base pair?

    <p>$0.34$ nm</p> Signup and view all the answers

    How many base pairs are there approximately in each turn of the DNA double helix?

    <p>$10$ bp</p> Signup and view all the answers

    What confers stability to the helical structure of DNA, in addition to H-bonds?

    <p>Distance between polynucleotide chains</p> Signup and view all the answers

    Which scientist proposed the Central dogma in molecular biology, stating the flow of genetic information from DNA to RNA to Protein?

    <p>Francis Crick</p> Signup and view all the answers

    What is the name of the reverse flow of genetic information in some viruses, from RNA to DNA?

    <p>Reverse transcription</p> Signup and view all the answers

    How is the length of a DNA double helix typically calculated in a mammalian cell?

    <p>By multiplying the number of base pairs with the distance between them</p> Signup and view all the answers

    What is the approximate length of a DNA double helix in a typical mammalian cell?

    <p>2.2 meters</p> Signup and view all the answers

    In prokaryotes like E.coli, where is the DNA packaged despite the absence of a defined nucleus?

    <p>Throughout the cell</p> Signup and view all the answers

    What did the Watson-Crick model suggest about the genetic material?

    <p>It would act as a template for synthesis of new strands.</p> Signup and view all the answers

    Which term best describes the replication process proposed by the Watson-Crick model?

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

    In the Meselson-Stahl experiment, what was used as the heavy isotope for nitrogen?

    <p>^15NH4Cl</p> Signup and view all the answers

    How did Meselson and Stahl distinguish between heavy DNA and normal DNA in their experiment?

    <p>By centrifugation in a cesium chloride density gradient.</p> Signup and view all the answers

    Which organism was first used to demonstrate semiconservative DNA replication according to the text?

    <p>Escherichia coli (E.coli)</p> Signup and view all the answers

    What did the Meselson-Stahl experiment prove about DNA replication?

    <p>DNA replicates semiconservatively.</p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser