CBSE  /  Class 12  /  Biology  /  Molecular Basis of Inheritance

  • 1. 
    A ribotide is made up of:

  • Ribose + Phosphate + Uracil
  • Deoxribose + Uracil + Phosphate
  • Thymine + Ribose + Phosphate
  • Deoxyribpse + Phosphate + Adenine

  • 2. 
    the enzyme involved in transcription is:

  • DNA Polymerase I
  • DNA Polymerase II
  • RNA Polymerase
  • DNA Polymerase

  • 3. 
    Antiparallel strands of a DNA molecule means that:

  • One strand turns clockwise
  • One strand turns anticlockwise
  • The phosphate groups at the start of two DNA strands are in opposite position
  • The phosphate groups at the start of two DNA strands, at their ends, share the same position

  • 4. 
    Which one is mainly transcribed:

  • Only RNA sequence
  • Middle repetitive DNA sequence
  • Highly repetitive DNA sequence
  • Single copy of DNA sequence

  • 5. 
    Amino acid sequence, in protein synthesis is decided by the sequence of?

  • c-DNA
  • r-RNA
  • f-RNA
  • m-RNA

  • 6. 
    DNA multiplication is also called:

  • Replication
  • Transduction
  • Translation
  • Transcription

  • 7. 
    During Protein synthesis, atone point the process comes to a halt. Select the group of the three codons from the following, from which any one of the three could bring about this halt:

  • UUC, UUA, UAC
  • UAG, UGA, UAA
  • UUE, UCA, UCG
  • UUU, UCC, UAU

  • 8. 
    One turn of the helix in p-from DNA is approximately:

  • 20 Å
  • 2 nm
  • 20 nm
  • 34 nm

  • 9. 
    Which is not component of lac operon:

  • Primer gene
  • Promoter gene
  • constructive gene
  • Regulator gene

  • 10. 
    Okazaki fregments is:

  • RNA primer
  • small segments of DNA on leading stand
  • Small segments of DNA on lagging stand
  • None of these
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