X-ray Crystallography: Data Processing Summary Quiz

10 Questions | By Ae342 | Updated: Mar 19, 2022 | Attempts: 307

Questions

Settings

Create your own Quiz

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