Class XII

Klinefelter’s syndrome is indicated by an XXY sex chromosome combination. This abnormality is due to:
  1. gene deletion.
  2. gene duplication.
  3. gene translocation.
  4. non-disjunction
By convention, a genotype of RR would indicate
  1. homozygous dominant on any chromosome.
  2. homozygous recessive on autosomes.
  3. heterozygous on male sex chromosomes.
  4. heterozygous on autosomes.
Molecular basis of organ differentiation relies on modulation in transcription by
  1. RBA polymerase
  2. ribosome
  3. anticodon
  4. transcription factor
Amino acid sequence in protein synthesis is decided by the sequence of
  1. tRNA
  2. mRNA
  3. cDNA
  4. rRNA
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.
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