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Home Biochemistry Nucleic Acids Comments

  • Question
  • The glycosidic bonds in DNA and RNA


  • Options
  • A. connect the sugar to the base
  • B. can be hydrolyzed by OH- ion
  • C. stabilize Watson-Crick H-bonds
  • D. are free to rotate over about 180°

  • Correct Answer
  • connect the sugar to the base 


  • Nucleic Acids problems


    Search Results


    • 1. In membranes, lipids are

    • Options
    • A. glycerophospholipids
    • B. sphingolipids
    • C. sterols
    • D. all of these
    • Discuss
    • 2. The smooth endoplasmic reticulum (SER) is the site of

    • Options
    • A. phospholipid synthesis
    • B. amino acid synthesis
    • C. carbohydrate synthesis
    • D. protein synthesis
    • Discuss
    • 3. In Fluid mosaic model, the biological membrane can be viewed as

    • Options
    • A. two dimensional solutions of oriented lipids and globular proteins
    • B. three dimensional solutions of oriented lipids and globular proteins
    • C. two dimensional solutions of oriented lipids and carbohydrate
    • D. three dimensional solutions of oriented lipids and carbohydrate
    • Discuss
    • 4. Membrane lipids are

    • Options
    • A. hydrophilic
    • B. hydrophobic
    • C. ampiphillic
    • D. none of these
    • Discuss
    • 5. The plasma membrane is a selectively permeable barrier due to presence of specific transport

    • Options
    • A. proteins
    • B. amino acids
    • C. carbohydrates
    • D. none of these
    • Discuss
    • 6. Thymidine

    • Options
    • A. can participate in hydrophobic interactions due to its methyl group
    • B. is replaced by uracil in RNA
    • C. normally forms two hydrogen bonds with adenosine
    • D. all of the above
    • Discuss
    • 7. In gel electrophoresis, what fragments will move most quickly through a gel?

    • Options
    • A. Large fragments
    • B. Small fragments
    • C. Large genome
    • D. None of these
    • Discuss
    • 8. A purine with an amine (NH2) group on the 6th carbon is

    • Options
    • A. adenine
    • B. cytosine
    • C. thymine
    • D. guanine
    • Discuss
    • 9. Because DNA is a highly charged polyanion, its stability to heat denaturation

    • Options
    • A. does not depend on hydrophobic interactions
    • B. increases with increasing salt
    • C. is independent of G - C content
    • D. decreases with increasing salt
    • Discuss
    • 10. The unfavourable free energy associated with not satisfying a hydrogen bond after formation of the double helix is approximately

    • Options
    • A. 10 kJ/mol
    • B. 20 kJ/mol
    • C. 25 kJ/mol
    • D. 30 kJ/mol
    • Discuss


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