Forensic Science: DNA Evidence

How many different nitrogen bases are there found in DNA?

• 4

• 3

• 5

• 8

Which of these DNA fragments for this electrophoresis sample is common to both the victim and suspect 1?

• B

• D

• E

• C

Tags

NGSS.HS-LS3-2

Which of these DNA fragments for this electrophoresis sample is common to both the victim and suspect 2?

• C

• D

• E

• A

Tags

NGSS.HS-LS3-1

Which suspect is more likely to have committed the crime?

• Suspect 1

• Suspect 2

Tags

NGSS.MS-LS2-4

Which suspects DNA matches the felons DNA at the crime scene?

• Suspect 1

• Suspect 2

• Suspect 3

• Keep looking, none of them match

DNA has a _______________ charge.

• negative

• positive

• equal

According to the rules of base pairing between complementary strands of DNA

• A pairs with C; and G pairs with T

• A pairs with C; and G pairs with U

• A pairs with G; and C pairs with T

• A pairs with T; and C pairs with G

The base pairs that hold together the complementary strands of DNA are linked together by

• hydrogen bonds

• nitrogenous bases

• phosphates

• enzymes

Different sized DNA fragments are then separated by size using

• Gel Electrophoresis

• Hybridization

• probe molecules

• restriction enzymes

A 32 year old female was found murdered in the hallway of the Forney High School building. Investigators

collected many samples of evidence including blood found on a knife near the body and hair

from the victim's shirt. Police had two suspects due to eyewitness accounts. Both suspects,

the victim and the evidence were analyzed using DNA fingerprinting.

Who does the blood evidence found at the crime scene most likely belong to?

• Suspect 1

• Suspect 2

• Victim

• Both the supect 1 and the victim