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Studying Proteins quiz

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  • What is the main purpose of SDS-PAGE in protein studies?
    SDS-PAGE is used to separate proteins based on their size using a polyacrylamide gel matrix.
  • How does SDS detergent affect proteins before SDS-PAGE?
    SDS detergent masks the protein's charge and makes all proteins negatively charged, allowing separation based solely on size.
  • What determines the migration speed of proteins in SDS-PAGE?
    The size of the protein determines its migration speed; smaller proteins move faster through the gel pores, while larger proteins move slower.
  • What is the role of the polyacrylamide gel matrix in SDS-PAGE?
    The polyacrylamide gel matrix acts as a porous medium that separates proteins based on their size.
  • After SDS-PAGE, how are proteins transferred for immunoblotting?
    Proteins are transferred from the gel onto a filter or paper, such as nitrocellulose, using an electric field.
  • What is immunoblotting used for in protein studies?
    Immunoblotting uses specific antibodies to detect and bind to target proteins, indicating their presence on the filter.
  • What is a limitation of SDS-PAGE when detecting proteins?
    SDS-PAGE requires the use of specific antibodies, so you must know which protein you are looking for.
  • How does 2D gel electrophoresis differ from SDS-PAGE?
    2D gel electrophoresis separates proteins based on both size and pH, allowing detection of up to 2,000 proteins simultaneously.
  • What advantage does 2D gel electrophoresis offer over SDS-PAGE?
    It provides a more diverse separation and can detect many proteins at once, not just those you have antibodies for.
  • What is mass spectrometry used for in protein research?
    Mass spectrometry identifies unknown proteins or peptides by sorting them based on their mass-to-charge ratio.
  • How are peptide sequences identified using mass spectrometry?
    Peptide sequences are matched to known proteins or organisms using specialized software after mass spectrometry analysis.
  • What is the function of NMR in protein studies?
    NMR (Nuclear Magnetic Resonance) is used to analyze the structures of proteins.
  • What does the yeast two-hybrid system test?
    The yeast two-hybrid system tests protein-protein interactions within a living organism.
  • How does the yeast two-hybrid system indicate protein interaction?
    If two proteins interact, their fused transcription factors activate the transcription of a reporter gene.
  • Why is the yeast two-hybrid system important for studying protein interactions?
    It allows researchers to confirm protein interactions inside living cells, rather than just in vitro conditions.