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Forensic Science: DNA Evidence

Total questions: 69

Worksheet time: 42mins

Name
Class
Date
1.

How many different nitrogen bases are there found in DNA?

a)

4

b)

3

c)

5

d)

8

2.

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

a)

B

b)

D

c)

E

d)

C

3.

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

a)

C

b)

D

c)

E

d)

A

4.

Which suspect is more likely to have committed the crime?

a)

Suspect 1

b)

Suspect 2

5.

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

a)

Suspect 1

b)

Suspect 2

c)

Suspect 3

d)

Keep looking, none of them match

6.

DNA has a _______________ charge.

a)

negative

b)

positive

c)

equal

7.

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

a)

A pairs with C; and G pairs with T

b)

A pairs with C; and G pairs with U

c)

A pairs with G; and C pairs with T

d)

A pairs with T; and C pairs with G

8.

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

a)

hydrogen bonds

b)

nitrogenous bases

c)

phosphates

d)

enzymes

9.

Different sized DNA fragments are then separated by size using

a)

Gel Electrophoresis

b)

Hybridization

c)

probe molecules

d)

restriction enzymes

10.

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?

a)

Suspect 1

b)

Suspect 2

c)

Victim

d)

Both the supect 1 and the victim

11.

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?

a)

Suspect 1

b)

Suspect 2

c)

The victim

d)

no match

12.

Type of DNA that varies most among individuals

a)

non coding DNA

b)

coding DNA

c)

Deoxyribose

d)

hydrogen bonds

13.

DNA must be extracted from cells to use in DNA analysis. DNA is found in the _________ of the cell and 2 membranes are broken down to extract DNA.

a)

nucleus

b)

plasma

c)

cytoplasm

d)

reticulum

14.

DNA amplification is accomplished by the

a)

polymerase chain reaction

b)

Gel Electrophoresis

c)

radioactive probes

d)

Southern Blot

15.

PCR will work on

a)

very small amounts of DNA

b)

toothbrush DNA

c)

denatured DNA

d)

All of the choices listed

16.

Mitochondrial DNA

a)

is used to trace maternal lineage (mother's side)

b)

is inherited from the father

c)

contains all of the genetic information for an individual

d)

is found in the nucleus

17.

In the nucleus of cells of humans there are _____ chromosomes.

a)

46 - 23 from mom, 23 from dad

b)

23 - all from mom

c)

128 - 64 from mom, 64 from dad

d)

92 - a mix of mom and dad

18.

Mitochondrial DNA makes up ___% of the total DNA in the body.

a)

1

b)

50

c)

undetermined

d)

3

19.

CODIS is the abbreviation for the

a)

common DNA index system

b)

combined DNA index system

c)

coding DNA index system

d)

criminal DNA index system

20.

In gel electrophoresis DNA molecules migrate from _____ to _____ ends of the gel.

a)

negative to positive

b)

acidic to basic

c)

long to short

d)

positive to negative

21.

In DNA replication, polymerases:

a)

help assemble the new DNA

strands in proper base sequence

b)

enable the strands to unwind from

the helix

c)

separate the strands of the double

helix

d)

none of the above

22.

This type of evidence can only belong to one person.

a)

Class

b)

Individual

c)

Circumstantial

d)

Direct

23.

This type of evidence can be used to narrow down a list of suspects, but can't be linked to a single person.

a)

Class

b)

Individual

c)

DNA

d)

Exoneration

24.

This is the most common reason for a wrongful conviction.

a)

Eyewitness Misidentification

b)

Government Misconduct

c)

Improper Forensics

d)

False Confession

25.

Surveillance footage shows Ms. Scarlett in the jewelry store, sneaking items into her bag. This is an example of _____ evidence.

a)

Direct

b)

Circumstantial

26.

Hairs are found at a crime scene, which are the same color and length as Professor Plum's. This is an example of ____ evidence.

a)

Direct

b)

Circumstantial

27.

What does it mean to be exonerated?

a)

Evidence collected at a crime scene

b)

Convicted to death row

c)

Released on parole

d)

Proven innocent of a crime

28.

The Innocence Project typically uses ___ evidence to exonerate wrongfully convicted people.

a)

Eyewitness Statements

b)

Good Behavior

c)

DNA

d)

Direct

29.

What does DNA stand for?

a)

Deoxyribonucleic acid

b)

Denitrogenous acid

c)

Double nucleotide arrangement

d)

Diribonucleic acid

30.
Adenine bonds with ______________.
a)
Guanine
b)
Thymine
c)
Cytosine
d)
Adenine
31.
Guanine bonds with ______________.
a)
Adenine
b)
Guanine
c)
Cytosine
d)
Thymine
32.

DNA sources include all of the following except?

a)

urine

b)

cartilage

c)

red blood cells

d)

Hair follicle

33.

Mitochondrial DNA is inherited from

a)

the mother only

b)

the father only

c)

both parents equally

d)

both parents unequally

34.

Biological evidence should be

a)

stored in air-tight containers

b)

frozen using liquid nitrogen

c)

packaged as quickly as possible

d)

put into breathable containers

35.

This database contains DNA profiles for felons and unsolved crimes.

a)

DNAI

b)

CODIS

c)

AFIS

d)

CODNA

36.

What does CODIS stand for?

a)

Crazy Old Dogs Intimidate Snakes

b)

Convicted Offender DNA Index System

c)

Combined DNA Index System

d)

Cameron Occasionally Dreams Instead of Studying

37.

DNA can place a person at a crime scene, even if they claim they have never been there.

a)

True

b)

False

38.

DNA evidence can do all of the following except

a)

refute a claim of self-defense

b)

identify when a suspect was at a crime scene

c)

link two or more crime scenes

d)

corroborate an alibi

39.

Which factor does NOT affect DNA left at a crime scene?

a)

heat

b)

sunlight

c)

mold

d)

all 3 factors can affect DNA evidence

40.

Gel electrophoresis is used to separate DNA fragments on the basis of which property?

a)

size

b)

color

c)

functions

d)

chromosomes

41.
Whose blood was found at the crime scene?
a)
John
b)
Lisa
c)
Bob
d)
Sure
42.

Who can be included as source of paternal DNA for this child?

a)

male #1

b)

male #2

c)

neither male

43.
Which male is the father of this child?
a)
Male 1
b)
Male 2
c)
Neither could be the father
d)
Either could be the father
44.
Mr. Jones was killed in a car accident.  Afterwards, a former girlfriend filed a paternity suit claiming that Mr. Jones was the father of her child, and thus she was entitled to the man’s estate.  Which sample of DNA would have to be from Mr. Jones if he were the child’s father? 
a)
2
b)
3
c)
4
d)
5
45.
Bob was found dead in his home.  Crime scene analysis showed signs of a struggle.  Blood was collected from the crime scene, the victim, and three suspects.  Which suspect likely committed the crime? 
a)
Sue
b)
Lisa
c)
John
d)
None of these
46.
Based on these results whose blood was found in the blood stain at the crime scene?
a)
Bob
b)
Sue
c)
John
d)
Lisa
47.

Who is credited for discovering DNA fingerprinting?

a)

Watson & Crick

b)

Edmond Locard

c)

Ms. Amster

d)

Alec Jeffreys

48.

In which year was DNA evidence first used to get a conviction at trial?

a)

1987

b)

1929

c)

2001

d)

1978

49.
The shape of the DNA molecule is a double __________________?
a)
"S"
b)
helix
c)
rope
d)
curve
50.

Where is DNA found???

a)

Cell membrane

b)

Nucleus

c)

Cell wall

d)

Auditorium

51.

What does the structure of DNA resemble?

a)

an airplane propeller

b)

a twisted ladder

c)

a twisted Christmas tree

d)

a hippo in a tutu

52.

What are the name of structures which contain DNA???

a)

Zoneosomes

b)

Colonsomes

c)

Bromosomes

d)

Chromosomes

53.
What is the sugar in DNA called?
a)
Deoxyribose
b)

Ribose

c)
Diglyceride
d)

Cellulose

54.
In a molecule of double-stranded DNA, the amount of Adenine present is always equal to the amount of
a)
cytosine
b)
guanine
c)
thymine
d)
uracil
55.
What will the matching sequence be on a strand that reads AAGCTAT?
a)
AACGATA
b)
TTCGTTA
c)
CCTGATA
d)
TTCGATA
56.
Which shows the correct complementary base pairing for DNA?
a)
C-A, T-G
b)
A-G, C-T
c)
C-G, U-A
d)
T-A, G-C
57.
Which sequence of DNA bases would pair with this partial strand
ATG TGA CAG
a)
ATG TGA CAG
b)
TAC ACT GTC
c)
GTA AGT GAC
d)
CAT TCA CTG
58.
If one side of a DNA strand is A-A-T-C-G-G-A, what would the other side be?
a)
A-A-T-C-G-G-A
b)
G-G-C-A-T-T-AG
c)
T-T-A-G-C-C-T 
d)
C-C-G-A-T-T-C
59.
Which process requires the most DNA?
a)
RFLP
b)
STR
c)
PCR
d)
Recombinant DNA
60.
What does the CoDIS database contain?
a)
Mugshots
b)
DNA profiles
c)
Top-secret government information
d)
Facebook login information
61.
What does PCR stand for?
a)
Poly-ambiguous chain reaction
b)
Pentahedral corrosion remnant
c)
Polymerase chain reaction
d)
Peroxide corrosion remnant
62.
What portion of the DNA is stored in CODIS?
a)
True
b)
False
63.
How many STR markers does the FBI use to identify criminals in America?
a)
17
b)
4
c)
26
d)
13
64.
Restriction enzymes are used to ___ DNA.
a)
glue together
b)
cut
c)
reconnect
d)
exchange
65.
Terri is creating a model of DNA, which of these shapes illustrates how her model should look? 
a)
A
b)
B
c)
C
d)
D
66.
Under what circumstances might two people have identical DNA?
a)

Fraternal Twins

b)

Identical twins

c)

Siblings

d)

None (or extremely rare cases). Even identical twins have differences in non coding sections

67.
DNA finger printing relies on:
a)
Difference in patterns of genes between individuals
b)
Difference in order of genes between individuals
c)
Difference in junk DNA patterns between individuals
d)
All of these
68.
The DNA fingerprint pattern of a child is
a)
75% similar to the father
b)
75% similar to the mother
c)
50% bands similar to father and rest similar to mother
d)
Exactly similar to that of both of the parents
69.
Why do markers in a DNA profile, like the one to the left with marker #13 highlighted, sometimes have only one peak?
a)
The person is missing a marker.
b)
The PCR was done incorrectly and needs to be repeated.
c)
The person has a genetic disease.
d)
The person inherited the same marker from both parents.

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