Class XII

Removal of introns and joining the exons in a defined order in a transcription unit is called
  1. Splicing
  2. tailing
  3. transformation
  4. capping
Molecular basis of organ differentiation relies on modulation in transcription by
  1. RBA polymerase
  2. ribosome
  3. anticodon
  4. transcription factor
The recessive genes located on X chromosome in humans are always
  1. lethal
  2. sublethal
  3. expressed in males
  4. expressed in females
If a recombinant DNA carrying antibiotic resistance gene (e.g., tetracycline) is transferred into an E.coli cell, then the host cell is transformed into tetracycline resistant cell. The tetracycline resistant gene in this case is called a
  1. vector
  2. selectable marker
  3. cloning site
  4. recombinant protein.
Pleiotropic gene is
  1. thalesmia
  2. colour blindness
  3. haemophilia
  4. sickle cellanemia
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