DNA Fingerprinting and Gel Electrophoresis Quiz

What is the primary reason hair DNA can be used to identify a suspect in a crime?

• Hair DNA is more stable than other types of DNA.

• Hair DNA is easier to collect than fingerprints.

• Hair DNA is less likely to degrade over time.

• Hair DNA is unique to each individual.

What principle allows DNA to move through the gel in gel electrophoresis?

• DNA is attracted to the negative end of the gel.

• DNA is attracted to the positive end of the gel.

• DNA is repelled by the negative end of the gel.

• DNA is repelled by the positive end of the gel.

Why do smaller DNA fragments move faster through the gel?

• They are lighter than larger fragments.

• They can maneuver more easily through the gel matrix.

• They have a stronger charge than larger fragments.

• They are more attracted to the positive end.

What is the purpose of the DNA ladder in gel electrophoresis?

• To visualize DNA under UV light.

• To increase the speed of DNA movement.

• To provide a reference for determining fragment sizes.

• To separate DNA fragments by charge.

How are DNA bands visualized after gel electrophoresis?

• By heating the gel.

• By staining the gel with a dye.

• With a gel imager and UV light.

• Using a microscope.

What indicates that the DNA from the crime scene matches a suspect's DNA?

• The DNA bands are the same shape.

• The DNA bands are in the same location on the gel.

• The DNA bands are the same size.

• The DNA bands are the same color.

How can the size of an unknown DNA fragment be estimated?

• By comparing it to a known DNA sequence.

• By measuring its speed through the gel.

• By comparing it to the DNA ladder.

• By weighing the DNA fragment.

What is the unit of measurement for DNA fragment size?

• Liters (L)

• Meters (m)

• Base pairs (BP)

• Kilograms (kg)

What does the inverse relationship between DNA fragment size and speed indicate?

• Larger fragments move faster.

• Smaller fragments move slower.

• Smaller fragments move faster.

• All fragments move at the same speed.

What is the final step in the gel electrophoresis process?

• Loading the DNA samples.

• Estimating the DNA fragment sizes.

• Running the gel.

• Visualizing the DNA bands.