Basics Of Nucleic Acids Part - I

20 Questions | Total Attempts: 443

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Nucleic acids are biological molecules essential for life, and include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid). To get basic information booklet on BASICS OF NUCELIC ACIDS. Just login and get the ebook study material at http://biochemden. In


Questions and Answers
  • 1. 
    The best role of Purine and pyrimidine nucleotides is to serve as the monomeric precursors of....
    • A. 

      RNA

    • B. 

      DNA

    • C. 

      Both of the above

    • D. 

      None of the above

  • 2. 
    The purine nucleotides act as the components of ……
    • A. 

      FAD

    • B. 

      NAD

    • C. 

      NADP+

    • D. 

      All of the above

  • 3. 
    The pyrimidine nucleotides act as the high energy intermediates…
    • A. 

      UDPG

    • B. 

      ATP

    • C. 

      ADP

    • D. 

      AMP

  • 4. 
    The chemical name of Thymine….
    • A. 

      2-oxy-4-4-aminopyrimidine

    • B. 

      2,4-dioxy-5-dipyrimidine

    • C. 

      2,4-dioxypyrimidine

    • D. 

      None of the above

  • 5. 
    The chemical name of 2-amino-6-oxypurine is said to be….
    • A. 

      Adenine

    • B. 

      Xanthine

    • C. 

      Guanine

    • D. 

      Hypoxanthine

  • 6. 
    The lactum form is the predominant tautomer of ….
    • A. 

      Uracil

    • B. 

      Cytosine

    • C. 

      Adenine

    • D. 

      Xanthine

  • 7. 
    N7-methylguanine has been found more recently in the nucleic acids of the cells of ….
    • A. 

      Bacteria

    • B. 

      Yeast

    • C. 

      Plant

    • D. 

      Mammals

  • 8. 
    Hypoxanthine and ribose constitute ….
    • A. 

      Adenosine

    • B. 

      Inosine

    • C. 

      Guanosine

    • D. 

      Cytidine

  • 9. 
    Thymine and deoxyriboxe form….
    • A. 

      Deoxycytidine

    • B. 

      Deoxyadenosine

    • C. 

      Deoxythymidine

    • D. 

      Deoxyuridine

  • 10. 
    The most abundant intracellular free nucleotides….
    • A. 

      ATP

    • B. 

      FAD+

    • C. 

      NAD+

    • D. 

      NADP+

  • 11. 
    The concentration of ATP in living mammalian cells in mM is near
    • A. 

      0.2

    • B. 

      0.4

    • C. 

      0.6

    • D. 

      1.0

  • 12. 
    The biosynthesis of Phosphoglycerides in animal tissue requires.
    • A. 

      UTP

    • B. 

      CTP

    • C. 

      GTP

    • D. 

      ATP

  • 13. 
    “Transforming factor” is used for the name of ….
    • A. 

      RNA

    • B. 

      DNA

    • C. 

      TRNS

    • D. 

      None of the above

  • 14. 
    Guanosine nucleotide is held by the cytosine nucleotide by the number of hydrogen bonds….
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 15. 
    Within the single turn of DNA the number of base pair exits…
    • A. 

      4

    • B. 

      6

    • C. 

      8

    • D. 

      10

  • 16. 
    Each turn of DNA structure has a pitch in nm of ….
    • A. 

      1.4

    • B. 

      2.4

    • C. 

      3.4

    • D. 

      4.4

  • 17. 
    The double stranded DNA molecules loses its viscosity upon….
    • A. 

      Denaturation

    • B. 

      Filtration

    • C. 

      Sedimentation

    • D. 

      Concentration

  • 18. 
    A nucleoside consists of
    • A. 

      Nitrogenous base

    • B. 

      Purine or pyrimidine base + sugar

    • C. 

      Purine or pyrimidine base + phosphorous

    • D. 

      Purine + pyrimidine base + sugar + phosphorous

  • 19. 
    Nucleotides and nucleic acids concentration are often also expressed in terms of
    • A. 

      Ng

    • B. 

      Mg

    • C. 

      Meq

    • D. 

      OD at 260nm

  • 20. 
    The carbon of the pentose in ester linkage with the phosphate in a nucleotide structure is...
    • A. 

      C1

    • B. 

      C3

    • C. 

      C4

    • D. 

      C5

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