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Hair and Fiber Analysis
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Which of the following is NOT a presumptive test for fibers?
 
density test
 
burn test
 
solvent test
 
stain test
The fiber dissolves in HCl. It is more likely to be:
 
nylon
 
cotton
 
wool
 
acetate
The medullary index of a hair was calculated to be 0.498. The hair is more likely to be:
 
from an animal
 
from a human
 
from a plant
 
from a baby
What are functions of hair
 
all of the responses
 
regulation of body temperature
 
facilitation of evaporation of perspiration
 
protection
What does burning wool smell like
 
burned hair
 
burned paper
Can age be determined by hair alone
 
no
 
yes
Hair can be best characterized as originating from an animal by examining
 
the medulla and cuticle
 
the hair shaft
 
its scale structure
 
the growth pattern
Forcibly removed hair is most likely to provide DNA because they have
 
follicular tissue
 
the hair shaft
 
scale patterns
 
cuticle
The cortex of hair derives its major forensic importance from the fact that it contains
 
pigments
 
scales
 
medullae
 
dna
Which of the following properties should be examined when comparing 2 fibers
 
color
 
diameter
 
texture
 
shape
The portion of the hair containing its scales is best characterized by
 
the cuticle
 
the cortex
 
the root
 
the follicle
Before the 20th century, all fibers were
 
natural
 
synthtic
 
chemically treated
 
derived
The rate of human hair growth per month is
 
1 cm
 
1 inch
 
1 ml
 
2 inches
In the collection of fiber evidence, great care should be taken to..
 
avoid cross-contamination of evidence
 
vacuum each item
 
shake off all garments to be sent for examination
 
package all items together
Which is NOT a synthetic fiber
 
All of them are synthetic
 
Rayon
 
Polyester
 
Acrylic
A fiber's microscopic appearance being ribbon-like in shape with twists at irregular intervals:
 
cotton
 
polyester
 
nylon
 
acrylic
The most prevalent natural plant fiber is...
 
cotton
 
linen
 
silk
 
hemp
Determining whether a hair sample originated from male or female, the MOST important factor is:
 
the results of DNA analysis performed on the root structure
 
whether the hair is bleached
 
whether the hair was dyed
 
the length of the hair
If hair does not have DNA, an expert witness is on best scientific footing when stating that...
 
a suspect hair comes from a particular animal species
 
the hair in question comes from a 21-year old
 
his examination reveals that the hair is that of a male
 
the given hair comes from a specific person
Medullae may be classified as being..
 
all of the above
 
interrupted or absent
 
fragmented
 
continuous
The medullary index of human hair is ______the medullary index for most other animals.
 
Less than
 
Greater than
 
The same as
 
Equal to
The central canal running through many hairs is known as the...
 
medulla
 
shaft
 
cortex
 
root
Pigment granules that impart hair with color are found in the...
 
cortex
 
medulla
 
cuticle
A cast of a hair surface can be made by using...
 
clear nail polish
 
iodine
 
wax
 
paint
Which feature of hair is MOST important in making species identification?
 
scale pattern
 
follicle shape
 
bulb size
 
shaft lenghth
Which one is not a layer of the hair shaft?
 
follicle
 
cuticle
 
cortex
 
medulla
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