DNA Structure and Function
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Questions and Answers

What stabilizes the structure of the DNA double helix?

  • Van der Waals forces between the strands
  • Hydrogen bonds between the base pairs (correct)
  • Ionic bonds between phosphate groups
  • Covalent bonds within the sugar backbone
  • Which statement accurately describes the orientation of DNA strands?

  • Both strands are parallel to each other
  • Strands are oriented randomly in a double helix
  • One strand runs from 3' to 5', and the other runs from 5' to 3' (correct)
  • Both strands run in the same direction, 5' to 3'
  • What is the role of the sugar and phosphate molecules in DNA?

  • To form the base pairs
  • To contribute to the helical shape
  • To form the sides of the DNA ladder (correct)
  • To create the hydrogen bonds
  • Which pairing rule regarding base pairs in DNA is correct?

    <p>Adenine pairs with Thymine using 2 hydrogen bonds</p> Signup and view all the answers

    What characteristic of the DNA double helix ensures a consistent shape?

    <p>The uniform diameter due to complementary base pairing</p> Signup and view all the answers

    Study Notes

    DNA Structure

    • DNA is a double-stranded molecule, shaped like a spiral staircase or helix.
    • The two strands are antiparallel, running in opposite directions (5' to 3' and 3' to 5').
    • The DNA structure resembles a twisted ladder, with the sugar-phosphate backbone forming the sides and the base pairs forming the steps.
    • The backbone is composed of alternating deoxyribose sugar and phosphate molecules.
    • Base pairs follow specific rules: Adenine (A) pairs with Thymine (T), and Cytosine (C) pairs with Guanine (G).
    • This complementary base pairing occurs via hydrogen bonds (2 between A and T, 3 between C and G).
    • Hydrogen bonds stabilize the structure of the DNA double helix.
    • The consistent base pairing maintains a uniform diameter for the DNA double helix.

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    Description

    Explore the intricate structure of DNA, a double-stranded molecule fundamental to all living organisms. This quiz covers the arrangement of nucleotides, base pairing rules, and the significance of the sugar-phosphate backbone in maintaining DNA's stability. Test your knowledge on the helical nature of DNA and its components.

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