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Exam 11: Hairs and Fibers

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Question 61

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

A) True
B) False

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Question 62

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Most animals have medullae that are either continuous or interrupted.

A) True
B) False

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Question 63

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It is common to obtain a physical match for fibers.

In making hair evaluations, it is best to view the hairs using a(n) ________ microscope.

A criminalist is more likely to obtain DNA from hairs in the:

Name two natural fibers and two manufactured fibers. If all four of these fibers were found at a crime scene, what would be the proper procedure for their collection and preservation?

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 -Natural fibers

For standard/reference hair sampling from a victim, the collection of a minimum of ________ full-length head hairs and ________ full-length pubic hairs is recommended.

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

A criminalist is most likely to collect DNA from hairs in the catagen stage.

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 -Polymer

Synthetic fibers display ________ because they are crystalline.

By far the most prevalent plant fiber 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 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 -Nuclear DNA

A criminalist is attempting to find the side of a glass pane from which a shattering force originated. How can that be determined when examining a fragment from a radial crack? A concentric crack?

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

The scale pattern of the cuticle is an important feature for characterizing ________ hair.

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 -Medulla

What was the first man-made fiber?

The criminalist typically has many fibers available for analysis.