Exam 11: Hairs and Fibers

Synthetic fibers display ________ because they are crystalline.

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

The criminalist typically has many fibers available for analysis.

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

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

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

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

Most animals have medullae that are either continuous or interrupted.

It is common to obtain a physical match for fibers.

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?

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.

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

By far the most prevalent plant fiber is:

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?

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

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

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

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

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

What was the first man-made fiber?