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Home Biochemistry Nucleic Acids Comments

  • Question
  • A five carbon sugar lacking a hydrogen at the number 2 carbon is found in


  • Options
  • A. DNA
  • B. RNA
  • C. mRNA
  • D. rDNA

  • Correct Answer
  • DNA 


  • Nucleic Acids problems


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    • 1. Which of the following is a purine?

    • Options
    • A. Cytosine
    • B. Adenine
    • C. Thymine
    • D. Uracil
    • Discuss
    • 2. 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
    • 3. 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
    • Discuss
    • 4. 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
    • 5. 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
    • 6. Which of the following is found on RNA but not DNA?

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

    • Options
    • A. Cytosine
    • B. Thymine
    • C. Uracil
    • D. Adenine
    • Discuss
    • 8. Nucleic acids can be analyzed experimentally by their

    • Options
    • A. molecular weight
    • B. absorption of visible light
    • C. absorption of uv light
    • D. none of these
    • Discuss
    • 9. The most stabilizing force for nucleic acids is

    • Options
    • A. hydrogen bonds
    • B. electrostatic bond
    • C. Van der Waals
    • D. conformational entropy
    • Discuss
    • 10. The sugar in RNA is __________ , the sugar in DNA is __________

    • Options
    • A. deoxyribose, ribose
    • B. ribose, deoxyribose
    • C. ribose, phosphate
    • D. ribose, uracil
    • Discuss


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