DNA Fingerprinting 2025

What is a DNA fingerprint?

• A pattern left behind by the oils on a person’s fingers

• A unique pattern made from fragments of a person’s DNA for comparison

• A sample of DNA that has been copied many times

• A DNA pattern that is shared by all members of a family

Why is it necessary to perform PCR before gel electrophoresis?

• To cut the DNA into fragments

• To sort the DNA by size

• To make many copies of the DNA so that it is able to be seen

• To break down the DNA small enough to fit into the little tubes

What is a restriction enzyme?

• A sugar that speeds up a reaction

• A protein that slows down the movement of the DNA

• A protein that cuts DNA at a specific place

• A sugar that copies the DNA

What is the purpose of gel electrophoresis?

• Separate DNA fragments by size to compare samples

• Order DNA fragments by color to determine members of a family

• Copy DNA so that there is enough for many types of testing

• Cut DNA into fragments

This laboratory procedure is known as

• CLONING

• gel electrophoresis

• chromatography

• use of a dichotomous key

If opposite charges attract, what charge must the DNA in order to move away from the wells?

• positive

• negative

• not enough information to determine

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A student performed a gel electrophoresis experiment. The results are represented in the diagram

below. Compared to the fragments at the top of the gel, the fragments at the lower end are

• larger, and move slower

• larger, and move faster

• smaller, and move faster

• smaller, and move slower

Based on these results whose blood was found in the blood stain at the crime scene?

• Bob
• Sue
• John
• Lisa

Which two bear species are most closely related?

• Bear 1 and Bear 2
• Bear 1 and Bear 3
• Bear 2 and Bear 3
• There’s no way to tell

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