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Home Biochemistry Nucleic Acids Comments

  • Question
  • Nucleotide bases and aromatic amino acids absorb light respectively at


  • Options
  • A. 280 and 260 nm
  • B. 260 and 280 nm
  • C. 270 and 280 nm
  • D. 260 and 270 nm

  • Correct Answer
  • 260 and 280 nm 


  • Nucleic Acids problems


    Search Results


    • 1. 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
    • 2. 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
    • 3. A purine with an amine (NH2) group on the 6th carbon is

    • Options
    • A. adenine
    • B. cytosine
    • C. thymine
    • D. guanine
    • Discuss
    • 4. 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
    • 5. 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
    • 6. A nucleotide consists of

    • Options
    • A. a sugar, a base and a phosphate
    • B. a sugar and a phosphate
    • C. paired bases
    • D. a sugar, a base and three phosphates
    • Discuss
    • 7. Which of the following is a purine?

    • Options
    • A. Cytosine
    • B. Adenine
    • C. Thymine
    • D. Uracil
    • Discuss
    • 8. A five carbon sugar lacking a hydrogen at the number 2 carbon is found in

    • Options
    • A. DNA
    • B. RNA
    • C. mRNA
    • D. rDNA
    • Discuss
    • 9. Which of the following is found on RNA but not DNA?

    • Options
    • A. Uracil
    • B. Deoxyribose
    • C. Phosphate
    • D. Adenine
    • Discuss
    • 10. Which pyrimidine base contains an amino group at carbon 4?

    • Options
    • A. Cytosine
    • B. Thymine
    • C. Uracil
    • D. Adenine
    • Discuss


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