BMS1031 Bacterial Genetics Example Q's

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1. Horizontal (lateral) gene transfer in bacteria can occur via:

  • transcription
  • recombination
  • transposition
  • cojugation
  • replication
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2. Which amino acid does the tRNA 5'-AAC-3' code?

  • Glutamine (GAA)
  • Lysine (UUA, CUU etc)
  • Valine (GUU)
  • Asparagine (GAU)

3. The formation of the 2:3 stem-loop in the trpL leader RNA of the E.coli trp operon:

  • all of the above
  • prevents attenuation of the trp operon
  • is facilitated when Trp levels in the cell are low
  • prevents the formation of the 3:4 stem loop
  • occurs when the ribosome stalls in trpL

4. Lambda bacteriophage:

  • always integrates into the hosts chromosome
  • is transfered via conjugation
  • always lyses the host cell
  • can enter either a lytic or lysogenic growth phase
  • never lyses the host cell

5. which codon serves as the start codon in mRNA for translation?

  • UGG
  • AUG
  • UGA
  • AGU


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