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Proteomics quiz

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  • What is the proteome?
    The proteome is the complete set of proteins encoded by a genome, which can vary depending on environmental conditions and timing.
  • How can a single gene produce multiple protein forms?
    A single gene can produce multiple protein forms through processes like alternative splicing and RNA editing, resulting in protein isoforms.
  • Why is the proteome larger than the number of protein-coding genes?
    Protein processing methods such as alternative splicing and RNA editing create multiple protein isoforms from one gene, expanding the proteome.
  • What does gel electrophoresis do in proteomics?
    Gel electrophoresis separates proteins based on their mass or charge, helping to analyze protein samples.
  • What is SDS-PAGE used for?
    SDS-PAGE is a type of gel electrophoresis that separates proteins by their mass (size or weight).
  • What is isoelectric focusing?
    Isoelectric focusing is a gel electrophoresis technique that separates proteins by their charge, allowing them to migrate to the point where their charge is zero.
  • How do proteins behave during isoelectric focusing?
    Proteins migrate in the gel until they reach their isoelectric point, where their net charge is zero and they stop moving.
  • What is mass spectrometry used for in proteomics?
    Mass spectrometry identifies proteins by their mass and charge and can determine their amino acid sequences.
  • What is tandem mass spectrometry?
    Tandem mass spectrometry separates proteins by mass and charge and can identify the amino acid sequence of a protein.
  • How does tandem mass spectrometry determine amino acid sequences?
    It detects different sizes and charges of amino acids, representing them as peaks, which can be used to deduce the sequence.
  • What is a protein microarray?
    A protein microarray is a technique that detects proteins and protein-protein interactions using antibodies fixed to a plate.
  • How does a protein microarray identify proteins in a sample?
    Proteins in the sample bind to specific antibodies on the plate, indicating their presence; unbound proteins were not present in the sample.
  • Why do different proteins appear as dots in gel electrophoresis?
    Different proteins appear as dots because they are separated by both mass and charge, resulting in distinct positions on the gel.
  • What information can mass spectrometry provide about proteins?
    Mass spectrometry can identify which proteins are present in a sample and determine their amino acid sequences.
  • Why is proteomics considered dynamic?
    Proteomics is dynamic because the set of proteins expressed by a cell, tissue, or organism changes in response to environmental conditions and timing.