Hair and Fibers

The hair shaft is composed of what important protein?

• Cellulose 

• Chitin

• Peptidoglycan

• Keratin

Tags

NGSS.MS-LS3-1

We know hair is from a human if…

• The medullary index is 0.5 or greater           

• The medullary index is 0.33 or less

• The cuticle is coronal

• The medulla is fragmented

Number 2 is pointing to what structure of the hair?

• Cortex

• Medulla

• Cuticle

• None of These

Fiber evidence is gathered with 

• vacuums

• tape or lint roller

• forceps

• all choices correct

Type of cuticle

• coronal

• spinous

• imbricate

• solid

The most common type of regenerated fiber, derived from cellulose is

• cotton

• rayon

• silk

• nylon

Fibers that have spun together are called

• textile

• yarn

• mineral fiber

• fiber

All of the following are true about fiber evidence EXCEPT

• It is possible to determine the composition and quantrities of its chemical makeup using gas chromatography and mass spectrophotometer.

• It is generally considered to be class evidence.

• It can be used to place a person at a crime scene at a specific time.

• It is analyzed using microscopes.

What is the medulla index for the pictured hair?

• 0.25

• 0.5

• 0.75

• 0.9

What type of cuticle scale pattern is this?

• Imbricate

• Spinous

• Coronal