Skip to main content
Back

Protein Extraction quiz

Control buttons has been changed to "navigation" mode.
1/15
  • What is the first step in purifying a protein from cells?
    The first step is protein extraction, which involves removing all proteins from the cells.
  • What is cell homogenization?
    Cell homogenization is the process of breaking open cells to release their contents into solution.
  • What is the crude extract or homogenate?
    The crude extract or homogenate is the total released contents of the cell after homogenization.
  • Name three types of molecules found in the crude extract.
    The crude extract contains proteins, lipids, carbohydrates, and nucleic acids.
  • Does protein extraction result in purified proteins?
    No, protein extraction results in a mixture of proteins and other cellular components, not purified proteins.
  • What are two organelles found in the crude extract?
    The crude extract contains organelles such as the nucleus and mitochondria.
  • What is the purpose of using lysis buffers in protein extraction?
    Lysis buffers are used to interact with and break open the plasma membrane of cells.
  • How does a blender or homogenizer help in protein extraction?
    A blender or homogenizer physically breaks open cells to release their contents.
  • What is sonication and how is it used in protein extraction?
    Sonication uses sound waves to break open cells during the homogenization process.
  • After protein extraction, what is the next step in protein purification?
    The next step is differential centrifugation to further purify the proteins.
  • Why is protein extraction necessary before purification?
    Protein extraction is necessary to obtain all proteins from the cells before they can be purified.
  • What is released into solution during cell homogenization?
    All cellular contents, including proteins, organelles, and other molecules, are released into solution.
  • In the example given, what type of cell was used for protein extraction?
    A red blood cell was used as the example for protein extraction.
  • What other cellular structures are present in the crude extract besides proteins?
    The crude extract also contains organelles like the nucleus, endoplasmic reticulum, and mitochondria, as well as RNA, DNA, and carbohydrates.
  • Why is the mixture obtained after protein extraction called a crude extract?
    It is called a crude extract because it contains a mixture of all cellular components, not just the proteins of interest.