Forensics -- hair and fiber vocab quiz

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comparison microscope
a compound microscope that allows the side-by-side comparison of samples, such as hair or fibers
cortex
the region of a hair located outside the medulla that contains granules of pigment
cuticle
the tough outer covering of a hair that is composed of overlapping scales
gas chromatography
a method of separating chemicals to establish their quantities
hair folicle
the actively growing base of hair that contains DNA and living cels
hair shaft
part of the hair above the follicle; contains mitochondrial DNA
keratin
a type of fibrous protein that makes up the majority of the cortex of a hair
medulla
the central core of the cell
melanin granules
bits of pigment found in the cortex of a hair
mitochondrial DNA (mDNA)
genetic material in the mitochondria of the cytoplasm of a cell; only inherited from the mother
nuclear DNA
genetic material in the nucleus of the cell
amorphous
without a defined shape; fibers composed of a loose arrangement of polymers that are soft, elastic, and absorbing (ex. cotton)
crystalline
geometrically shaped; fibers composed of polymer packed side by side, which makes them stiff and strong (ex. flax)
direct transfer
the passing of evidence, such as fiber, from victim to suspect or vice versa
fiber
the smallest indivisible unit of textile, it must be at least 100 times longer than wide
mineral fiber
a collection of mineral crystals formed into a recognizable pattern
monomer
small, repeating molecules that can link to form polymers
natural fiber
a fiber produced naturally and harvested from animal, plant or mineral sources
polymer
a substance composed of long chains of repeating molecules
secondary transfer
the transfer of evidence such as fiber from a source (ex. carpet) to a person (suspect), and then to another person (victim)
synthetic fiber
a fiber made from a manufactured substance such as plastic
textile
a flexible, flat material made by interlacing yarns (or threads)
warp
a lengthwise yarn or thread in a weave
weft
a crosswise yarn or thread
yarn (thread)
fibers that have been spun together
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