DNA Backbone Structure Quiz
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Questions and Answers

Which term describes the arrangement of DNA strands running in opposite directions?

  • Parallel
  • Collinear
  • Orthogonal
  • Antiparallel (correct)

    • What is the spacing between base-pairs in DNA?

  • 0.34 nm (correct)
  • 0.25 nm
  • 0.68 nm
  • 1.0 nm

    • How many bases are typically present per turn in the right-handed helix formation of DNA?

  • 10 bases (correct)
  • 20 bases
  • 15 bases
  • 5 bases

    • Where are nitrogenous bases more accessible in the DNA molecule?

    <p>Major groove</p> Signup and view all the answers

    In what direction does one polynucleotide strand run in DNA?

    <p>5' → 3'</p> Signup and view all the answers

    How does the right-handed helix formation of DNA affect DNA-protein interactions?

    <p>It influences accessibility of nitrogenous bases for protein binding</p> Signup and view all the answers

    What is the main function of DNA as described in the text?

    <p>Storing and transmitting genetic information</p> Signup and view all the answers

    Why were scientists originally unsure whether DNA or proteins encoded genetic information?

    <p>The chemical properties of proteins favored encoding genetic information.</p> Signup and view all the answers

    What property of DNA made it ideal for storing and transmitting genetic information?

    <p>Reliability in carrying heritable information</p> Signup and view all the answers

    Why were scientists led to believe that proteins might be the genetic material?

    <p>DNA initially appeared less capable of encoding genetic information.</p> Signup and view all the answers

    Which property of proteins made them less than ideal for storing and transmitting genetic information?

    <p>Insufficient reliability in carrying heritable information</p> Signup and view all the answers

    What function was crucial for DNA to maintain genetic variation?

    <p>Generation of mutations</p> Signup and view all the answers

    What technique did Maurice Wilkins and Rosalind Franklin use to study the molecular structure of DNA?

    <p>X-ray crystallography</p> Signup and view all the answers

    What critical piece of evidence did Watson and Crick use to determine the structure of DNA?

    <p>Franklin's X-ray diffraction image</p> Signup and view all the answers

    Why did Watson and Crick realize that the bases in DNA could not pair like with like?

    <p>It would create a helix with an inconsistent width</p> Signup and view all the answers

    In DNA, which base pairs have three hydrogen bonds between them?

    <p>G-C pairs</p> Signup and view all the answers

    What observation by Chargaff influenced Watson and Crick's correct base pairing deduction?

    <p>$A = T$ and $G = C$ in any organism</p> Signup and view all the answers

    What technique did Watson and Crick use to deduce the width of the helix and the spacing of the nitrogenous bases in DNA?

    <p>X-ray crystallography</p> Signup and view all the answers

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