Gel Electrophoresis & Forensic Analysis Quiz

What is the purpose of gel electrophoresis in forensic science?

• To examine hair under a microscope

• To match fingerprints

• To separate DNA fragments by size

• To analyze chemical toxins

During gel electrophoresis, smaller DNA fragments:

• A) Move faster and further

• B) Move slower and shorter

• C) Remain stationary

• D) Move vertically

Which of the following accurately describes the DNA evidence from the crime scene in this lab?

• DNA matched Ishmael Jones

• DNA matched Daniel Cruz

• DNA matched the Police Officer

• DNA was inconclusive

What component allows visualization of DNA bands after gel electrophoresis?

• Heat lamp

• UV or blue LED light

• Regular fluorescent light

• Natural sunlight

Why are restriction enzymes essential for DNA analysis in gel electrophoresis?

• They increase DNA quantity

• They stain DNA fragments

• They cut DNA at specific sequences

• They speed up DNA movement

What is the correct order of loading DNA samples into wells in this lab?

• Victim, Crime scene hair, Officer, Ishmael, Daniel

• Crime scene hair, Victim, Ishmael, Officer, Daniel

• Daniel, Ishmael, Officer, Victim, Crime scene hair

• Ishmael, Daniel, Victim, Crime scene hair, Officer

In gel electrophoresis, DNA fragments are separated by size. Fill in the blank: Smaller fragments move _______ than larger ones.

• faster

• slower

• the same speed

If the DNA banding pattern from the hair sample matches Daniel Cruz, what conclusion can you draw?

• Ishmael Jones was at the crime scene

• Daniel Cruz was at the crime scene

• DNA analysis was inconclusive

• The hair belongs to the Police Officer

If DNA from the crime scene does NOT match Ishmael Jones, what does this indicate?

• Ishmael Jones should remain convicted

• Daniel Cruz is definitively guilty

• Ishmael Jones was wrongfully convicted

• No further investigation is needed

Tags

NGSS.HS-LS3-1

What conclusion is supported if fingerprints from the crime scene match Daniel Cruz, and DNA evidence from the hair sample also matches him?

• Both Ishmael Jones and Daniel Cruz were involved

• Daniel Cruz should be considered a primary suspect

• Ishmael Jones’ conviction is still valid

• The crime scene was contaminated