Question 1

Describe the process of comparing two fibers via microscopic and analytical methods. What morphological characteristics should a criminalist compare in these steps?

Accepted Answer

(should include points such as):
A criminalist first microscopically compares the color and diameter of the fibers. Other morphological features that may aid in the comparison are lengthwise striations (lined markings)on the surface of some fibers and the pitting of the fiber's surface with delustering particles added in the manufacturing process to reduce shine. The cross-sectional shape of a fiber may also help characterize the fiber. Confirmation of a color comparison can then be made by comparing the fibers' spectral patterns with a microspectrophotometer. A physical characteristic that is frequently used to identify fibers is an infrared absorption spectrum.

Question 2

Medullae may be classified as being:

Accepted Answer

A) Interrupted or absent. 
B) Fragmented. 
C) Continuous. 
D) All of the above 
A) Interrupted or absent. 
B) Fragmented. 
C) Continuous. 
D) All of the above D

Question 3

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once.
A)Fibers derived from either natural or synthetic polymers
B)A transition stage between the anagen and telogen phases of hair growth
C)Two or more atoms held together by chemical bonds
D)A cellular column running through the center of the hair
E)DNA that is present in the nucleus of a cell and that is inherited from both parents
F)The scale structure covering the exterior of the hair
G)The final growth phase in which hair naturally falls out of the skin
H)DNA present in small structures outside the nucleus of a cell.. This form of DNA is inherited maternally (from the mother).
I)A substance composed of a large number of atoms that are usually arranged in repeating units
J)The main body of the hair shaft
K)Fibers derived entirely from animal or plant sources
L)The basic unit of structure from which a polymer is constructed
M)A molecule with a high molecular mass
N)The initial growth phase during which the hair follicle actively produces hair
O)A translucent piece of tissue surrounding the hair's shaft near the root that contains the richest source of DNA associated with hair
-Manufactured fibers

Accepted Answer

A

Question 4

It is a virtual certainty that two fabrics share a common origin if their fibers:

Accepted Answer

A) Can be fitted together at their torn edges. 
B) Have the same striations. 
C) Have the same color. 
D) Appear identical in cross-section. 
A) Can be fitted together at their torn edges. 
B) Have the same striations. 
C) Have the same color. 
D) Appear identical in cross-section.

Question 5

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once.
A)Fibers derived from either natural or synthetic polymers
B)A transition stage between the anagen and telogen phases of hair growth
C)Two or more atoms held together by chemical bonds
D)A cellular column running through the center of the hair
E)DNA that is present in the nucleus of a cell and that is inherited from both parents
F)The scale structure covering the exterior of the hair
G)The final growth phase in which hair naturally falls out of the skin
H)DNA present in small structures outside the nucleus of a cell.. This form of DNA is inherited maternally (from the mother).
I)A substance composed of a large number of atoms that are usually arranged in repeating units
J)The main body of the hair shaft
K)Fibers derived entirely from animal or plant sources
L)The basic unit of structure from which a polymer is constructed
M)A molecule with a high molecular mass
N)The initial growth phase during which the hair follicle actively produces hair
O)A translucent piece of tissue surrounding the hair's shaft near the root that contains the richest source of DNA associated with hair
-Follicular tag

Accepted Answer

The answer of Match the word in Column 1 to...

Question 6

A microscopic examination can tell whether a hair is from a man or a woman.

Accepted Answer

A) True 
 B)False

Question 7

Much of a hair's resistance and stability is attributed to the cuticle.

Accepted Answer

A) True 
 B)False

Question 8

Which would involve determining the refractive index of the fibers?

Accepted Answer

A) Microscopic examination for color and diameter of fibers 
B) Infrared spectrophotometry 
C) Study of the birefringence of the fibers 
D) TLC study of dyes in fibers 
A) Microscopic examination for color and diameter of fibers 
B) Infrared spectrophotometry 
C) Study of the birefringence of the fibers 
D) TLC study of dyes in fibers

Question 9

The monomers involved in the synthesis of proteins are:

Accepted Answer

A) Sugars. 
B) Amino acids. 
C) Fatty acids. 
D) Starches. 
A) Sugars. 
B) Amino acids. 
C) Fatty acids. 
D) Starches.

Question 10

Which would produce "fingerprints" of the fibers?

Accepted Answer

A) Examination of dye composition using a visible light microspectrophotometer 
B) Make a cross-sectional view of the fibers 
C) Microscopic examination for color and diameter of fibers 
D) Infrared spectrophotometry 
A) Examination of dye composition using a visible light microspectrophotometer 
B) Make a cross-sectional view of the fibers 
C) Microscopic examination for color and diameter of fibers 
D) Infrared spectrophotometry

Question 11

Some hairs in the anagen phase have a ________ tag containing DNA that may be analyzed in order to individualize the hair.

Accepted Answer

The answer of Some hairs in the anagen phase have...

Question 12

The ________ is the main body of the hair shaft.

Accepted Answer

The answer of The ________ is the main body of...

Question 13

The medullary index of human hair is ________ the medullary index for most other animals.

Accepted Answer

A) The same as 
B) Less than 
C) Greater than 
D) None of the above 
A) The same as 
B) Less than 
C) Greater than 
D) None of the above

Question 14

One feature that makes hair a good subject for establishing individual identity is its resistance to chemical ________.

Accepted Answer

The answer of One feature that makes hair a good...

Question 15

If a hair does not have a follicular tag, an expert witness is on best scientific footing when stating that:

Accepted Answer

A) The hair in question comes from a 21-year-old. 
B) His/her examination reveals that the hair is that of a male. 
C) The given hair comes from a specific person. 
D) A suspect hair comes from a particular animal species. 
A) The hair in question comes from a 21-year-old. 
B) His/her examination reveals that the hair is that of a male. 
C) The given hair comes from a specific person. 
D) A suspect hair comes from a particular animal species.

Question 16

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once.
A)Fibers derived from either natural or synthetic polymers
B)A transition stage between the anagen and telogen phases of hair growth
C)Two or more atoms held together by chemical bonds
D)A cellular column running through the center of the hair
E)DNA that is present in the nucleus of a cell and that is inherited from both parents
F)The scale structure covering the exterior of the hair
G)The final growth phase in which hair naturally falls out of the skin
H)DNA present in small structures outside the nucleus of a cell.. This form of DNA is inherited maternally (from the mother).
I)A substance composed of a large number of atoms that are usually arranged in repeating units
J)The main body of the hair shaft
K)Fibers derived entirely from animal or plant sources
L)The basic unit of structure from which a polymer is constructed
M)A molecule with a high molecular mass
N)The initial growth phase during which the hair follicle actively produces hair
O)A translucent piece of tissue surrounding the hair's shaft near the root that contains the richest source of DNA associated with hair
-Cortex

Accepted Answer

The answer of Match the word in Column 1 to...

Question 17

Manufactured fibers have increasingly replaced natural fibers in garments and fabrics.

Accepted Answer

A) True 
 B)False

Question 18

Name and briefly define the three layers of the hair shaft.

Accepted Answer

(should include points such as):
The thr

Question 19

Before the 20th century, all fibers were:

Accepted Answer

A) Natural. 
B) Regenerated. 
C) Synthetic. 
D) Derived. 
A) Natural. 
B) Regenerated. 
C) Synthetic. 
D) Derived.

Question 20

A hair sample was examined and its medulla appeared to have a pattern described as resembling a string of pearls. It was most likely from a:

Accepted Answer

A) Rabbit. 
B) Deer. 
C) Cat. 
D) Mouse. 
A) Rabbit. 
B) Deer. 
C) Cat. 
D) Mouse.

Describe the process of comparing two fibers via microscopic and analytical methods. What morphological characteristics should a criminalist compare in these steps?

Medullae may be classified as being:

It is a virtual certainty that two fabrics share a common origin if their fibers:

A microscopic examination can tell whether a hair is from a man or a woman.

Much of a hair's resistance and stability is attributed to the cuticle.

Which would involve determining the refractive index of the fibers?

The monomers involved in the synthesis of proteins are:

Which would produce "fingerprints" of the fibers?

Some hairs in the anagen phase have a ________ tag containing DNA that may be analyzed in order to individualize the hair.

The ________ is the main body of the hair shaft.

The medullary index of human hair is ________ the medullary index for most other animals.

One feature that makes hair a good subject for establishing individual identity is its resistance to chemical ________.

If a hair does not have a follicular tag, an expert witness is on best scientific footing when stating that:

Manufactured fibers have increasingly replaced natural fibers in garments and fabrics.

Name and briefly define the three layers of the hair shaft.

Before the 20th century, all fibers were:

A hair sample was examined and its medulla appeared to have a pattern described as resembling a string of pearls. It was most likely from a:

Introduction

The Crime Scene

Physical Evidence

Crime Scene Reconstruction: Blood Stain Pattern Analysis

Death Investigation

Fingerprints

Forensic Biometrics

The Microscope

Firearms, Tool Marks, and Other Impressions

Matter, Light, and Glass Examination

Drugs

Forensic Toxicology

Metals, Paint, and Soil

Forensic Serology

DNA: The Indispensable Forensic Science Tool

Forensic Aspects of Fire and Explosion Investigation

Document Examination

Computer Forensics

Mobile Device Forensics

Filters

Exam 11: Hairs and Fibers

Describe the process of comparing two fibers via microscopic and analytical methods. What morphological characteristics should a criminalist compare in these steps?

Medullae may be classified as being:

It is a virtual certainty that two fabrics share a common origin if their fibers:

A microscopic examination can tell whether a hair is from a man or a woman.

Much of a hair's resistance and stability is attributed to the cuticle.

Which would involve determining the refractive index of the fibers?

The monomers involved in the synthesis of proteins are:

Which would produce "fingerprints" of the fibers?

Some hairs in the anagen phase have a ________ tag containing DNA that may be analyzed in order to individualize the hair.

The ________ is the main body of the hair shaft.

The medullary index of human hair is ________ the medullary index for most other animals.

One feature that makes hair a good subject for establishing individual identity is its resistance to chemical ________.

If a hair does not have a follicular tag, an expert witness is on best scientific footing when stating that:

Manufactured fibers have increasingly replaced natural fibers in garments and fabrics.

Name and briefly define the three layers of the hair shaft.

Before the 20th century, all fibers were:

A hair sample was examined and its medulla appeared to have a pattern described as resembling a string of pearls. It was most likely from a:

Introduction

The Crime Scene

Physical Evidence

Crime Scene Reconstruction: Blood Stain Pattern Analysis

Death Investigation

Fingerprints

Forensic Biometrics

The Microscope

Firearms, Tool Marks, and Other Impressions

Matter, Light, and Glass Examination

Drugs

Forensic Toxicology

Metals, Paint, and Soil

Forensic Serology

DNA: The Indispensable Forensic Science Tool

Forensic Aspects of Fire and Explosion Investigation

Document Examination

Computer Forensics

Mobile Device Forensics

Filters