Chapter 11 Forensics

A regenerated fiber can be derived from

Cellulose

What is not a synthetic fiber?

Rayon

Nuclear DNA typing can be most successfully accomplished on hairs that have been removed during which stage of growth?

Anagenic

A fiber whose microscopic appearance includes being ribbon-like in shape (flat) with twists at irregular intervals is

Cotton

Which part of the hair shaft is the most resistant to chemical decomposition

Cuticle

Which race is most likely to have hair with continuous medullae

Mongoloid

Which would produce "fingerprints" of the fibers?

Infrared spectrophotometry

The central canal running through many hairs is known as the

Medulla

Microscopic hair comparisons must be regarded by police and courts as:

Presumptive

Forcibly removed hairs are most likely to provide useful DNA evidence because they bear:

Follicular tissue

Which statement is true?

Two hairs from the same head may not have the same morphological characteristics

Rayon is classified as:

Regenerated fiber

By far the most prevalent plant fiber is:

Cotton

The visible light microspectrophotometer is a convenient tool with which to compare the color of fibers because

All of the above

Which of the following properties should be examined when comparing two fibers?

All of the above

The rate of human hair growth per month is:

1 cm

Beard hairs are coarse and normally ________ in cross-section.

Triangular

A human head hair is best characterized by

A medulla that is absent or is less than 1/3 overall diameter of the hair shaft

The cortex of hair derives its major forensic importance from the fact that it contains:

Pigment

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

Can be fitted together at their torn edges

The layers of the hair shaft are the ________, the ________, and the ________.

Cuticle; cortex; medulla

Which step in the examination of fibers would logically be taken first?

Microscopic examination for color and diameter of fibers

Which feature of hair is MOST important in making a species identification?

Scale pattern

Medullae may be classified as being

All of the above

Which feature of hair is MOST important in making a species identification?

Medullary index