BMS1031 Molecular Biology

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1. Cofactors are:

  • Molecule attached to haemoglobin which binds oxygen reversibly
  • Molecules which control protein degradation
  • Vitamins and minerals thats associate with active sites of an enzyme to increase reactivity
  • Light sensitive molecules attached to a signalling protein
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2. What is the role of tRNA?

  • Decodes mRNA for protein synthesis, bringing the correct amino acid to the end of the protein
  • Regulated gene expression through RNA interference.
  • Codes for proteins
  • Component of ribosomes, catalyzing protein synthesis

3. What is the role of topoisomerase during DNA replication?

  • Prevents rewinding of DNA after seperation
  • Holds DNA polymerase in place to stop it falling of DNA
  • Relieves twists in DNA ahead to prevent super coiling, by creating a nick ahead of the replication fork
  • Unwinds DNA strands to allow access by other replication machinery

4. How does rifamycin work?

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

5. Bacterial mRNA is often polycistronic, meaning?

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


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