Cell Biology and Micro-biology

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1. The E.coli gene lacY encodes for which of the following proteins?

  • Beta-glactoside permease
  • Beta-galactosidase
  • Thiogalactoside transacetylase
  • Beta haemoglobin
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2. the process by which a plasmid can be transferred from one bacterial cell to another is termed what?

  • translation
  • transconjugation
  • transphosphorylation
  • transcription

3. During cytoplasmic eukaryotic protein synthesis, the initiator tRNA molecule carries which of the following amino acids?

  • Lysine
  • Methionine
  • Tryptophan
  • Proline

4. Which of the following cells would you expect to have the thinnest layer of peptidoglycan in their cell wall?

  • A gram positive bacterial cell
  • A gram negative bacterial cell
  • A mammalian cell
  • A yeast cell

5. Which statement is correct?

  • polydenylation adds coding sequences to the mRNA
  • polydenylation slows down the degradation of mRNA
  • polydenylation speeds up the degradation of mRNA
  • polydenylation occurs at the 5' end of mRNA molecule


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