X-ray Crystallography: Data Processing Summary Quiz

10 Questions | Total Attempts: 78

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Medical Quizzes & Trivia

Questions and Answers
  • 1. 
    What must we do to our crystal to collect the various reflections we need to analyse our protein?
    • A. 

      Rotate it

    • B. 

      Nothing

    • C. 

      Use computer software to predict these other reflections

    • D. 

      Look at the signal:noise ratio to separate these other reflections from background noise

  • 2. 
    Mosflm is one of the many statistics we use analyse the quality of our data.
    • A. 

      True

    • B. 

      False

  • 3. 
    The number of unique reflections is the total number of reflections measured during an experiment.
    • A. 

      True

    • B. 

      False

  • 4. 
    What must you do before analysing your data statistically?
    • A. 

      Decide on a likely lattice type and unit cell size

    • B. 

      Calculate amplitudes of diffracted waves

    • C. 

      Identify and get rid of any noise in the diffraction data

    • D. 

      Determine the asymmetric unit and the unit cell size

  • 5. 
    Why do we measure the intensity of our diffraction spots?
    • A. 

      To give us a list of reflection intensities we can compare

    • B. 

      To give us statistical information

    • C. 

      To help determine the lattice type and space group

    • D. 

      To give an indication of the quality of our data

  • 6. 
    Deciding on a unit cell size is part of the first step of processing your data.
    • A. 

      True

    • B. 

      False

  • 7. 
    Which of the following is an indication of data quality?
    • A. 

      Whether spots are where you expect them to be

    • B. 

      R-Factor

    • C. 

      The list of spot intensities

    • D. 

      R-Free

  • 8. 
    Why do we get two values for each statistic?
    • A. 

      One for all the data, and one for those at the edge of the detector

    • B. 

      One for inner reflections, and one for outer reflections

    • C. 

      One for high and low resolution data

  • 9. 
    Some statistical information can be gathered, before the processing of diffraction data.
    • A. 

      True

    • B. 

      False