Molecular Basis Of Inheritance

15 Questions | Total Attempts: 652

SettingsSettingsSettings
Please wait...
DNA Quizzes & Trivia

Time: 30 Minute


Questions and Answers
  • 1. 
    Select the incorrect option for genetic code?
    • A. 

      It is nearly universal

    • B. 

      It is degenerate

    • C. 

      It is unambiguous

    • D. 

      A codon in mRNA is read in a non contiguous fashion

  • 2. 
    Removal of introns and joining the exons in a defined order in a transcription unit is called
    • A. 

      Tailing

    • B. 

      Transformation

    • C. 

      Capping

    • D. 

      Splicing

  • 3. 
    Who amongst the following scientists had no contribution in the development of the double helix model for the structure of DNA?
    • A. 

      Rosalind Francklin

    • B. 

      Maurice Wilkins

    • C. 

      Erwin Chargaff

    • D. 

      Meselson and Stahl

  • 4. 
    Discontinuous synthesis of DNA occurs in one strand, because:
    • A. 

      DNA molecule being synthesized is very long

    • B. 

      DNA dependent DNA polymerase catalyses polymerization only in one direction (5' - 3')

    • C. 

      It is a more efficient process

    • D. 

      DNA ligase has to have a role

  • 5. 
    Which of the following steps in transcription is catalysed by RNA polymerase?
    • A. 

      Initiation

    • B. 

      Elongation

    • C. 

      Termination

    • D. 

      All of the above

  • 6. 
    Which of the following are the functions of RNA?
    • A. 

      It is a carrier of genetic information from DNA to ribosomes synthesizing polypetides

    • B. 

      It carries amino acids to ribosomes

    • C. 

      It is a constituent component of ribosomes

    • D. 

      All of the above

  • 7. 
    In some viruses, DNA is synthesized by using RNA as template. Such a DNA is called:
    • A. 

      A-DNA

    • B. 

      B-DNA

    • C. 

      CDNA

    • D. 

      RDNA

  • 8. 
    If Meselson and Stahl's experiment is continued for four generations is bacteria, the ratio of 15N/ 15N: 15N/14N: 14 N/14N containing DNA in the fourth generation would be:
    • A. 

      1:1:0

    • B. 

      1:4:0

    • C. 

      0:1:3

    • D. 

      0:1:7

  • 9. 
    If the sequence of nitrogen base of the coding strand of DNA in a transcription unit is:
    • A. 

      5' – A U G AA U G - 3'

    • B. 

      5' – U A C U U A C - 3'

    • C. 

      5' – C AU U C A U - 3'

    • D. 

      5' – G U A A G U A - 3'

  • 10. 
    If the base sequence of a codon in mRNA is 5' AUG-3', the sequence of tRNA pairing with it must be:
    • A. 

      5' UAC – 3'

    • B. 

      5' - CAU - 3'

    • C. 

      5' -AUG - 3'

    • D. 

      5' - GUA - 3'

  • 11. 
    The initiate translation, the mRNA first blinds to:
    • A. 

      The smaller ribosomal sub-unit

    • B. 

      The larger ribosomal sub-unit

    • C. 

      The whole ribosome

    • D. 

      No such specificity exists

  • 12. 
    In E.Coil, the lac Operon gets switched on when:
    • A. 

      Lactose is present and it binds to the repressor

    • B. 

      Repressor binds to operator

    • C. 

      RNA polymerase binds to the operator

    • D. 

      Lactose is present and it binds to RNA polymerase

  • 13. 
    Which of the following sequence will be produced as a result of transcription of the DNA sequence –CGATTACAG
    • A. 

      GCUAAUGUC

    • B. 

      CGUAAUCUG

    • C. 

      GCTAATGTC

    • D. 

      GCUAATCTG

  • 14. 
    Sickle-cell haemoglobin has valine in place of glutamic acid at position 6 in the f3 polypeptide chain. Reason: Sickle-cell anaemia is expressed only in homozygous recessive state.
    • A. 

      If both A and R are true R is the correct explanation of A

    • B. 

      If both A and R are true but R is not the correct explanation of A

    • C. 

      If A is true but R is false

    • D. 

      If both A and R are false

  • 15. 
    DNA fingerprinting is very well known for its application in paternity testing is case of disputes. Reason: It employs the principle of polymorphism in DNA sequences as the polymorphisms are inheritable from parents to children
    • A. 

      If both A and R are true R is the correct explanation of A

    • B. 

      If both A and R are true but R is not the correct explanation of A

    • C. 

      If A is true but R is false

    • D. 

      If both A and R are false