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Hair is an appendage of the skin, growing out of an organ known as the______
Hair follicle
the three layers that comprise the hair shaft are
Cuticle, Cortex, Medulla
the scales of most animal hairs can be described as having the appearance of shingles on a roof.
True
the_____ contains the pigment granules that impart color to hair
Cortex
the central canal running through many hairs is known as the _______
Medulla
The diameter of the medulla relative to the diameter of the hair shaft is the ______
Medullary Index
Human hair generally has a medullar index of less than_____; the hair of most animals has an index of _____ or greater.
1/3
1/2
Human head hairs generally exhibit (continuous, absent) medullae.
Absent
If a medulla exhibits a patterned shape, the hair is (human, animal) in origin.
Animal
The three stages of hair growth are
Anagen, Catagen, Telogen
A sing hair (can, cannot) be individualized to one person by microscopic examination.
Cannot
In making hair comparisons, it is best to view the hairs side by side under a ______ microscope.
Comparison
_____ hairs are short and curly, with wide variation in shaft diameter.
Pubic
It (is, is not) possible to determine the time when hair was last bleached or dyed
Is
The age and sex of the individual from whom a hair sample has been taken can be determined through an examination of the hair's morphological features.
False
Hair forcibly removed from the body (always, often) has follicular tissue adhering to its root.
Often
Microscopical hair comparisons must be regarded by police and courts as presumptive in nature and all positive microscopical hair comparisons must be confirmed by ______ typing.
DNA
currently, it is possible for DNA typing to provide individualization of a single hair.
False
A ______ hair root is a likely candidate for DNA typing.
Anagen
A minimum collection of ______ full length hairs will normally ensure a representative sampling of head hair.
50
A minimum collection of ______ full length pubic hairs is recommended to cover the range of characteristics present in this region of the body.
24
________ fibers are derived totally from animal or plant sources.
Natural
The most prevalent natural plant fiber is______
Cotton
Regenerated fibers, such as rayon and acetate, are manufactured by chemically treating cellulose and passing it through a spinneret.
True
Fibers manufactured solely from synthetic chemicals are classified as _______
Book answer:Man made
my answer: SYNTHETIC
Polyester was the first synthetic fiber.
False
______ are composed of a large number of atoms arranged in repeating units.
Polymers
The basic unit of the polymer is called the
Monomer
______ are polymers composed of thousands of amino acids linked in a highly organized arrangement and sequence.
Proteins
A first step in the forensic examination of fibers will be the comparison of color and diameter.
True
The microspectrophotmeter employing _______ light is a convenient way for analysts to compare the colors of fibers through spectral patterns.
Visible
The dye components removed from fibers can be separated and compared by _______ chromatography
Pyrolysis Gas Chromatography
Synthetic fibers possess the physical property of ______ because they are crystalline.
Birefringence
The micrspectrophotometer employing ______ light provides a rapid and reliable method fro identifying the generic calls of a single fiber.
Infrared
Normally, fibers possess (individual, class) characteristics.
Class
The two most important components of dried paint from the criminalist's point of view are the _____ and the ______
Individual, Vehicle
The most important physical property of paint relating to a forensic comparison is _______.
Layer structure
Paints can be individualized to a single source only when they have a sufficiently detailed ________.
Binder
The _______ layer provides corrosion resistance for the automobile.
Electrocoat primer
"Eye appeal" of the automobile comes from the ______ layer.
Base coat
Pyrolysis gas chromatography is a particularly valuable technique for characterizing paint's (binder, pigments).
Binder
Emission spectroscopy can be used to identify the (inorganic, organic) components of paint's pigments.
Inorganic
Paint samples removed for examination must always include all of the paint layers.
True
