BMS1031 Molecular Biology

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1. Bacterial mRNA is often polycistronic, meaning?

  • Have a 5' cap
  • Several proteins can be encoded from the same mRNA
  • mRNA only have one ribosome binding site
  • Only one protein can be encoded from a piece of mRNA
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Other questions in this quiz

2. Which of these is false about DNA and base paring?

  • Hydrogen bonds join base pairs together
  • DNA is planar
  • the sugar phosphate backbone is on the outside
  • A bp is made of a purine and a pyrimidine

3. How does rifamycin work?

  • blocks initiation of RNA chains by binding to RNA polymerase
  • Prevents the transition from translation initiation to elongation
  • Blocks binding of aminoacyl-tRNA to the A-site
  • Binds in the exit channel of the ribosome to RNA polymerase

4. UTRs are?

  • Retained in mRNA and translated
  • Retained in mRNA but untranslated
  • Lost in mRNA and untranslated
  • Form part of the intron and removed during splicing

5. DNA is made of which substrates?

  • Phosphate, pentose sugar and organic bases
  • Phosphate, ribose sugar and purine bases
  • Sulphate, pentose sugar and organic bases
  • Phosphate, hexose sugar and organic bases

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