Review #3 Forensic Science

Fibers are an excellent source of trace evidence because

• they are easily transferred from a victim to a suspect

• they are often overlooked by a suspect

• they can be easily collected and stored

• all of these choices

Natural fibers can be harvested from

• plants and animals

• only from plants

• only from animals

• plants, animals and minerals

All of the following are characteristics of a synthetic fiber except

• they are formed by combining monomer compounds into polymer molecules

• they are man-made

• they are used in the production of carpet fibers

• they do not contain any natural fibers

Tags

NGSS.MS-PS1-3

A characteristic of natural fibers is that they

• are stronger than synthetic fibers

• will not break down when exposed to bright light

• melt at a lower temperature that synthetic fibers

• are affected by microscopic organisms

Tags

NGSS.HS-LS2-6

Which of the following observations are used to help identify a specific fiber?

• smell of the burned fiber

• on contact with flame, does the fiber coil or melt?

• color and structure of the residue left after the fiber burns

• all of these choices

How many stages does hair go through during development?

• 1

• 2

• 3

• 4

Crime reconstruction involved forming a hypothesis of the sequence of events from before the crime was committed:

• through its commission (completion)

• through days after its commission (completion)

• to the present day

• none of these choices

Many dyes and hair treatments will fluoresce under certain color (wavelength) of light. In a fluorescence microscope, a beam of light of a certain color is used. If the sample contains particular chemicals, it will absorb some of the light and then reemit light of a different color. This is called:

• fluorescence

• effervescence

• incandescence

• none of these choices

Tags

NGSS.HS-PS4-3

NGSS.HS-PS4-5

The use of the comparison microscope to perform side-by-side analysis of hair collected from the crime scene and hair from a suspect or victim first occurred in:

• 1914

• 1924

• 1934

• 1944

A skilled botanist may be able to identify a type of habitat from a fragment of a plant.

• True

• False