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Exam 11: Hairs and Fibers

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Question 41

Multiple Choice

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

A) Scales.
B) Pigments.
C) Medullae.
D) DNA.

E) A) and B)
F) A) and C)

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Question 42

Multiple Choice

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By far the most prevalent plant fiber is:

A) Linen.
B) Silk.
C) Kapok.
D) Cotton.

E) C) and D)
F) A) and C)

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Question 43

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The three basic cuticle patterns are coronal,spinous,and ________.

Describe three analytical techniques for comparing the color of two fibers.

Which of the following questions cannot be answered with a microscopic examination of hair?

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

Forcibly removed hairs are most likely to provide useful DNA evidence.

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

Hair can best be characterized as originating from an animal by examining:

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

Which of the following properties should not be examined when comparing two synthetic fibers?

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

Finding white cotton fibers at a crime scene is nearly meaningless due to its wide use.

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

The rate of human hair growth per month is:

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 (mitochondria)outside the nucleus of a cell.Mitochondria supply energy to the 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 1)Anagen phase 2)Catagen phase 3)Cortex 4)Cuticle 5)Follicular tag 6)Macromolecule 7)Manufactured fibers 8)Medulla 9)Mitochondrial DNA 10)Molecule 11)Monomer 12)Natural fibers 13)Nuclear DNA 14)Polymer 15)Telogen phase

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:

Which was the first man-made fiber?

The monomers involved in the synthesis of proteins are: