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UNIT 5: Hair & Fibers Review

Total questions: 50

Worksheet time: 13hrs 30mins

Name
Class
Date
1.
The central core of the hair is called the...?
a)
Medulla
b)
Cuticle
c)
Cortex
d)
Shaft
2.
Human hairs generally have what two types of medulla?
a)
Continuous or interrupted
b)
Fragmented or none
c)
Solid or interrupted
d)
Fragmented or solid
3.
The average hair grows how much per month?
a)
1.3 cm
b)
2.4 cm
c)
.5 cm
d)
3.2 cm
4.
The best method to pick up hairs over a large surface area is...?
a)
gloves
b)
forceps
c)
tape lift
d)
vacuum
5.
The hair follicle is dormant and hairs are easily lost during which stage of the hair life cycle?
a)
Anagen
b)
Telogen
c)
Catagen
d)
Metagen
6.
The transitional or regressive stage that lasts a few weeks during which hair growth slows is called...?
a)
Anagen
b)
Telogen
c)
Catagen
d)
Metagen
7.
In order to determine if a hair is from an animal or human, one should divide the diameter of the...
a)
medulla by the entire hair
b)
medulla by the cortex
c)
cortex by the medulla
d)
cortex by the entire hair
8.
Hair is helpful in solving old crimes because…
a)
hair on a suspect never changes
b)
hair always contains DNA evidence
c)
hair takes little room to store in evidence closets
d)
hair does not easily decompose
9.
The hair shaft is composed of what important protein?
a)
Cellulose 
b)
Chitin
c)
Peptidoglycan
d)
Keratin
10.
Hair analysis may be used to determine all of the following except:
a)
manner in which the hair was removed
b)
body region from which the hair came from
c)
broad racial background of the individual from which the hair came from
d)
identity of the individual from which the hair came from
11.
The central core of the hair is called the...?
a)
Medulla
b)
Cuticle
c)
Cortex
d)
Shaft
12.
the middle layer of a hair shaft that provides its strength is
a)
the cortex
b)
the medulla
c)
the cuticle
d)
the polymer
13.
the spongy interior of a hair that gives it its flexibility
a)
cortex
b)
polymer
c)
medulla
d)
cuticle
14.
Hair is commonly used in forensic investigations
a)
true
b)
false
15.
hair is commonly found at crimescenes
a)
true
b)
false
16.
What type of evidence is hair considered?
a)
Individual
b)
Class
17.
The medulla in human hair can be ....
a)
Continuous
b)
fragmented
c)
absent
d)
all of the above
18.
hair always contains DNA
a)
true
b)
false
19.
The following medullary pattern is called
a)
fragmented 
b)
continuous
c)
interrupted
20.
What are two of the three stages of hair growth?
a)
Anagen and Pathogen
b)
Pathogen and Telogen
c)
Catagen and Anagen
21.
Which race is most likely to have a continuous medulla
a)
Caucasian
b)
African American
c)
Asian/Mongoloid
d)
None of these races
22.
Which analysis can be used to determine gender?
a)
Hair length analysis
b)
Hair dye analysis
c)
Bleached hair analysis
d)
DNA analysis
23.
What cuticle pattern is shown?
a)
imbricate
b)
spinous
c)
coronal
24.

In the diagram the layer in which I would observe the cuticle scale pattern would be indicated by the letter

a)

A

b)

B

c)

C

25.

In the diagram the cortex would be indicated by the letter

a)

A

b)

B

c)

C

26.

Identify the scale pattern

a)

coronal

b)

spinous

c)

imbricate

27.

Identify the scale pattern

a)

coronal

b)

imbricate

c)

spinous

28.

The medulla pattern shown would be

a)

absent

b)

continuous

c)

fragmented

d)

interrupted

29.

The medulla pattern shown would be

a)

absent

b)

continuous

c)

interrupted

d)

fragmented

30.

The medulla pattern shown would be

a)

absent

b)

continuous

c)

interrupted

d)

fragmented

31.

Which sample is likely human in origin?

a)

A

b)

B

32.
Fibers are woven into textiles or fabrics.
a)
True
b)
False
33.
Fibers that have been spun together are called:
a)
textile
b)
yarn
c)
mineral fiber
d)
a fiber
34.
When fibers are transferred directly from victim to suspect or suspect to victim, this is called:
a)
necessary transfer.
b)
direct transfer
c)
absolute transfer.
d)
None of these choices.
35.
The transfer of evidence such as a fiber from a source to a person, then to another person, is called:
a)
primary transfer
b)
tertiary transfer
c)
secondary transfer.
d)
direct transfer.
36.

Early collection of fibers in an investigation is critical. Within 24 hours, an estimated:

a)

75% of all fibers may have fallen from a victim or been lost from a crime scene.

b)

85% of all fibers may have fallen from a victim or been lost from a crime scene.

c)

95% of all fibers may have fallen from a victim or been lost from a crime scene.

d)

None of these choices.

37.
Fibers are classified as either:
a)
natural fibers or synthetic fibers.
b)
polymers or synthetic fibers.
c)
acrylic fibers or plant fibers.
d)
olefins or synthetic fibers
38.
Natural fibers come from:
a)
animals.
b)
plants.
c)
minerals that are mined from the ground.
d)
All of these choices.
39.
One seed fiber is:
a)
cotton
b)
coir.
c)
hemp.
d)
jute
40.
What is the most common animal fiber?
a)
Cotton
b)
Wool
c)
Polyester
d)
Rayon
41.
Fibers are considered what kind of evidence? 
a)
Individual
b)
Class
c)
Direct
d)
Indirect
42.
What is the most common plant fiber?
a)
Wool
b)
Rayon
c)
Cotton
d)
Polyester
43.
Fiber evidence is gathered with 
a)
vacuums
b)
tape or lint roller
c)
forceps
d)
all choices correct
44.
A fiber made from goat hair is called...
a)
Cashmere
b)
Sisal
c)
Coir
d)
Angora
45.
The name for man-made fibers is:
a)
processed fibers
b)
synthetic fibers
c)
natural fibers
d)
modified fibers
46.

Two methods that can analyze fibers without damaging them are

a)

polarizing light microscopy and infrared spectroscopy

b)

polarizing light spectroscopy and infrared microscopy

c)

heat and light

d)

None of these choices

47.

All plant fibers share the same common polymer that is

a)

cellulose

b)

protein

c)

sulferic acid

d)

None of these choices

48.

Flax is the most common Stem fiber and is found in the fiber

a)

linen

b)

cotton

c)

fiberglass

d)

coir

49.

The most common type of regenerated fiber is

a)

polyester

b)

Nylon

c)

Capron

d)

rayon

50.

Which of the following is NOT a test for fiber analysis?

a)

solvents

b)

refractive index

c)

burning

d)

density

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