Quiz about DNA Evidence

Question 1

What does DNA stand for?

Accepted Answer

Deoxyribonucleic acid

Answer

Denitrogenous acid

Answer

Deribonucleic acid

Answer

Diribonucleic acid

Question 2

In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of

Accepted Answer

thymine

Answer

cytosine

Answer

guanine

Answer

uracil

Question 3

Guanine bonds with ______________.

Accepted Answer

Cytosine

Answer

Adenine

Answer

Guanine

Answer

Thymine

Question 4

DNA codes for...

Accepted Answer

proteins

Answer

bases

Answer

amino acids

Answer

phosphates

Question 5

Which of the following contain molecules of DNA? Choose all that apply.

Accepted Answer

Saliva

Accepted Answer

Blood

Accepted Answer

Hair

Accepted Answer

Fragments of Skin

Question 6

What DNA is mostly used in criminal investigations?

Accepted Answer

Nuclear DNA

Answer

Mitochondrial DNA

Question 7

What DNA do you get from your biological mother?

Accepted Answer

Mitochondrial DNA

Answer

Nuclear DNA

Question 8

True or False: DNA evidence can tell you when someone was present at a crime scene.

Accepted Answer

False

Answer

True

Question 9

The molecular "scissors" used to CUT DNA are called

Accepted Answer

restriction enzymes

Answer

RFLP's

Answer

STRs

Answer

helicases

Question 10

In this DNA fingerprint, the _______ pieces travel the farthest. (blue)

Accepted Answer

shortest

Answer

longest

Question 11

Name a method of separating molecules, such as DNA, based on their size.

Accepted Answer

gel electrophoresis

Answer

restriction enzymes

Answer

polymerase chain reaction (PCR)

Answer

short tandem repeat (STR)

Question 12

__________ are variable regions of DNA that repeat.

Accepted Answer

Short tandem repeat (STR)

Answer

Restriction enzymes

Answer

Nitrogenous bases

Answer

Polymerase chain reaction (PCR)

Answer

Electrophoresis

Question 13

A region of DNA that does not code instructions to build a protein. Makes up a majority of our genome and is different from person to person.

Accepted Answer

Noncoding DNA

Answer

Coding DNA

Question 14

DNA is located in which organelles in the cell? Choose all that apply.

Accepted Answer

Nucleus

Accepted Answer

Mitochondria

Answer

Lysosomes

Answer

Ribosomes

Question 15

Whose blood was found at the crime scene?

Accepted Answer

John

Answer

Bob

Answer

Sue

Answer

Lisa

Question 16

What is the main goal of PCR?

Accepted Answer

Make lots of copies of DNA

Answer

Separate DNA fragments by size and charge

Answer

Extract DNA from cells

Question 17

The remains of a person are found with very little flesh on the bones. The person has been dead for some time so the DNA is degraded. Which type of DNA would you want to use for potential forensic analysis?

Accepted Answer

DNA from mitochondria

Answer

DNA from nucleus

Answer

DNA from Y chromosome

Question 18

The federal database for DNA profiles is

Accepted Answer

CODIS

Answer

AFIS

Answer

ARGIS

Answer

JARVIS

Question 19

Why does CODIS analyze 17 STR locations to build a DNA profile?

Accepted Answer

It increases the probability that profiles are a match.

Answer

It decreases the probability that profiles are a match.

Answer

There are 17 chromosomes in humans.

Question 20

Whose DNA profiles are in the CODIS database?

Accepted Answer

Convicted felons

Accepted Answer

DNA from unsolved crime scenes

Accepted Answer

Missing persons

Answer

Federal employess

Question 21

Why is there only one peak at STR location D3S1358?

Accepted Answer

Both chromosomes had the same number of STR repeats at this location.

Answer

Both chromosomes had different numbers of STR repeats at this location.

Answer

To save space on the electropherogram.

Question 22

Which male is the father of this child?

Accepted Answer

Male 2

Answer

Male 1

Answer

Neither could be the father

Answer

Either could be the father

Question 23

DNA fingerprinting works because

Accepted Answer

No two people, except identical twins, have exactly the same DNA

Answer

Most genes are dominant

Answer

All organisms contain RNA

Answer

The most important genes are different among most people

Question 24

Mitochondrial DNA is inherited from

Accepted Answer

the mother only

Answer

the father only

Answer

both parents equally

Answer

both parents unequally

Question 25

The DNA in a person's blood is the same as the DNA in his/her skin cells and saliva.

Accepted Answer

True

Answer

False

Question 26

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 hair evidence at the crime scene most likely belong to?

Accepted Answer

Suspect 1

Answer

Suspect 2

Answer

The victim

Answer

no match

Question 27

CODIS is the abbreviation for the

Accepted Answer

combined DNA index system

Answer

common DNA index system

Answer

coding DNA index system

Answer

criminal DNA index system

Question 28

What will the matching sequence be on a strand that reads AAGCTAT?

Accepted Answer

TTCGATA

Answer

AACGATA

Answer

TTCGTTA

Answer

CCTGATA

Question 29

What does PCR stand for?

Accepted Answer

Polymerase chain reaction

Answer

Poly-ambiguous chain reaction

Answer

Pentahedral corrosion remnant

Answer

Peroxide corrosion remnant

Question 30

Which suspect's DNA matches that of the Crime Scene (CS)?

Accepted Answer

Suspect 2

Answer

Suspect 1

Answer

Suspect 3

Answer

Suspect 4

Question 31

When DNA segments are being separated by size,

Accepted Answer

the big strands stay near the top, the little ones move to the bottom

Answer

the small strands stay near the top, the big ones move to the bottom

Answer

the small strands move to the middle, and the big ones move to the sides

Answer

the big strands move to the middle, and the small ones move to the sides

Question 32

How does agarose gel separate DNA fragments?

Accepted Answer

By filtering DNA based on size

Answer

By staining DNA fragments

Answer

By visualizing DNA profiles

Answer

By binding to DNA molecules

Question 33

(GAAT) (GAAT) (GAAT) (GAAT) is an example of:

Accepted Answer

STRs

Answer

restriction fragments

Answer

PCRs

Answer

DNA fingerprinting

Question 34

If one person has two alleles that are the same for a specific STR, then that person is considered to have:

Accepted Answer

homozygous genotypes.

Answer

rare occurring alleles.

Answer

heterozygous genotypes.

Answer

frequently occurring alleles.

Question 35

What is the STR in the following strand of DNA? AGTCAAGCTCGCTCGCTCGCTCAAT

Accepted Answer

GCTC

Answer

CTCA

Answer

AGCT

Answer

AGTC

Question 36

What term describes when a child inherits the same allele from both parents? If you're focusing on STRs, this might look like 5,5,

Accepted Answer

homozygous

Answer

heterozygous

Answer

homogeneous

Answer

heterogeneous

Question 37

If there is only one allele (one peak) on the electropherogram for a particular locus, what does that tell you about the genotype?

Accepted Answer

the genotype is homozygous

Answer

the genotype is heterozygous

Answer

the genotype is codominant

Answer

the person did not inherit any allesl for that STR loci

Question 38

On an electropherogram, alleles are represented by...

Accepted Answer

peaks on a graph

Answer

letters like AA or Aa

Answer

blue dots on a test strip

Answer

band on an autorad

Question 39

What is the name of the graphic display that results from STR analysis?

Accepted Answer

electropherogram

Answer

karyotype

Answer

PCR

Answer

electrophoresis

DNA Evidence

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