Quiz Two Bioprocess

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Quiz Two Bioprocess
2011-10-17 10:04:32
Quiz Two Bioprocess

Quiz Two Bioprocess Chapters 4,5
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  1. What does Separation and Purification of biochemicals depends?
    • Physico-chemical properties
    • Molecular Size
    • Charge
    • Solubility
    • Hydrophobic and Hydrophillic nature
    • Biological Affinity
  2. What is precipitation?
    A process of separating biological molecules from liquid phase by forming an insoluble aggregates
  3. What happens when Precipitation occurs by salting out?
    • Aggregates are formed by addition of reagents
    • Salt competes for H2O with protein
  4. What is Isoelectric precipitation?
    • A method to aggregate protien by rendering the protein no net electric charge
    • Can be done by addition of weak polar solvents or Nonionic polymer
  5. What is crystallization? What are the advantages and disadvantages?
    • Obtaining solid forms from impure solution by cooling and vaporization procedure
    • Advantage- Single processing step, low energy required
    • Disadvantage- non-uniform crystal size
  6. What is chromatography?
    A method of separation of mixtures that exploits the differences in partition behavior
  7. What is ion exchange chromatography?
    A column chromatography that uses a charged (protiens, amino acids, peptides) stationary phase
  8. What is size exclusion chromatography?
    A gel permeation chromatography or gel filtration chromatography and separates based on particle size
  9. What is affinity chromatography?
    Based on selective non-covalent interations between an analyte and specific molecules
  10. What does liquid-liquid extraction use?
    Compressed gas (usually CO2) as extracting solvent
  11. What is Lyophilization?
    • It is a process of drying by freezing
    • Used for long term storage
  12. What is Sterilization?
    Total destruction of all forms of life
  13. What does a disinfectant do?
    Destroy microorganism on inanimate objects
  14. What does an antiseptic do?
    Destroys microorganisms on living tissue
  15. What does sanitizing do?
    Reduces the number of microbes to a safe level
  16. What does sterilization do?
    Kill all microbes
  17. How does dry heat sterilization work?
    Autoclaving- 160-170 C for > 2 hours
  18. What is steam sterilization?
    A sterilization technique by moist heat reaching all the surfaces of the material to be sterilized
  19. What is gas sterilization?
    Using gases and vapors that possess germicidal properties
  20. What is sterilization by Ionizing radiation?
    Implement the use of electrons from accelerators or radioisotopes
  21. What are the advantages and disadvantages of liquid chemical sterilization?
    • Advantage- good to sterilize istems that dont withstand other types of sterilization
    • Disadvantage- corrosion of metal surfaces
    • Toxic residual effect on tissue
  22. What is filter sterilization?
    A technique used to physically exclude microorganisms from a fluid or air