CBSE  /  Class 12  /  Biology  /  Molecular Basis of Inheritance

  • 1. 
    Represser Lac-Operon protein attached to:

  • Operator
  • Inducer
  • Regulator
  • β-Glacto sidase

  • 2. 
    Following is important in Ïranscription:

  • DNA Methylase
  • CAAT Box
  • Promotar
  • DNA Polymerase

  • 3. 
    Anticodon found in:

  • On DNA
  • On t-RNA
  • On r-RNA
  • On m-RNA

  • 4. 
    In DNA helix:

  • Quadrate structure
  • Polarity
  • Antiparallel Polarity
  • Disuiphide bond

  • 5. 
    During splicing axon attached and inducer enzyme for reaction:

  • RNA Ligase
  • RNA Catalase
  • RNA permease
  • RNA poloymerase

  • 6. 
    During DNA synthesis formed segment is:

  • Polymerase fragment
  • RNA fragment
  • Okazaki fragment
  • RNA Primer

  • 7. 
    In a give DNA segment ATC ACC AGG ACC CCA ACA, the first base gets mutated. The effect of this on coding by the DNA segment will result in :

  • One amino acid less in protein
  • No change in the sequence
  • Complete change in the type and sequence of amino acid
  • Change in first amino acid only

  • 8. 
    DNA fragments are joined in a correct sequence by :

  • DNA ligase
  • RNA polymerase
  • Helicase
  • DNA polymerase

  • 9. 
    The ratio constant for a species is :

  • T+C/G + A
  • A+C/T + G
  • G + G/A + T
  • A + C/C + T

  • 10. 
    DNA repairing is done by:

  • By DNA polymerase I
  • By DNA Polymerase II
  • Both (a) and (b)
  • By Ligase
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