Hair and Fiber Analysis

The protein that makes up hair is called _____

• ninhydrin
• pigments 
• medulla
• keratin

The smallest unit of textile material that has a length many times greater than its diameter is..

• keratin 
• cuticles
• fibers
• chromatography

The deepest layer of hair (compared to the lead of a pencil) is the ___

• medulla
• cortex
• cuticle
• keratin 

The outside layer of a hair (compared to the ink on a pencil) is the ___

• medulla
• cortex
• cuticle
• keratin

Which layer of hair is the most important component when determining which individual human the hair came from?

• medulla
• cortex
• cuticle

The name for man-made fibers is:

• processed fibers
• synthetic fibers
• natural fibers
• modified fibers

Tags

NGSS.MS-PS1-3

Hair is helpful in solving old crimes because…

• hair on a suspect never changes
• hair always contains DNA evidence
• hair takes little room to store in evidence closets
• hair does not easily decompose

When collecting hair as evidence, a detective should NOT do which of the following?

• Pluck hairs from the suspect’s head
• Cut hairs from the suspect’s head
• Collect loose hairs from the suspect’s head
• A detective should do all of the above

Fibers are classified as either:

• natural fibers or synthetic fibers.
• polymers or synthetic fibers.
• acrylic fibers or plant fibers.
• olefins or synthetic fibers

Tags

NGSS.MS-PS1-3

Natural fibers come from:

• animals.
• plants.
• minerals that are mined from the ground.
• All of these choices.