Hair and Fibers

The middle layer of a hair (compared to the wood of 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

Where is Nuclear DNA found in the hair?

• root

•  hair shaft

• tip

• medulla

How do you distinguish between human and animal hair?

• Patterns of pigmentation

• medullary index

• cuticle type

• all of the above

The hair follicle is dormant (not growing hair anymore) and hairs are easily lost during which stage of the hair life cycle?

• Anagen

• Telogen

• Catagen

• Metagen

Which technique is commonly used for collecting fiber evidence at a crime scene?

• Vacuuming

• Burning

• Washing

• Cutting

All of the following are macroscopic characteristics of hair except

• length

• texture

• color

• medulla pattern

• thickness

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