# X-ray Crystallography: Data Processing Summary Quiz

10 Questions | Attempts: 307
Share  Settings  • 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

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