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Hair and Fiber Analysis

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