Question

1. asbestos is often used around pipes and fireplaces, in ceiling and floor tiles, shingles, home siding, and insulation because of what property?

a. it is durable and long lasting
b. it can be molded into many different shapes
c. it is not fire resistant
d. it is easy to handle and install on big projects

1. when searching for fiber evidence, what should forensic scientists do first?

a. shine light from an infrared spectroscope to make fibers more visible
b. crawl on the ground with forceps and collect fibers as they find them
c. visually search the area
d. use a vacuum to make sure they don’t miss any small fibers

1. if there is a limited amount of fiber found at the crime scene, scientists perform this test so that will not damage the evidence:

a. chromatography
b. infrared spectroscopy
c. density test
d. solvent test

1. hemp comes from what part of a plant?

a. seed
b. stem
c. fruit
d. leaf

1. cotton comes from which part of a plant?

a. seed
b. stem
c. fruit
d. leaf

1. humans have the most hair on their body...

a. when they are born.
b. once they reach sexual maturity and adulthood
c. during puberty.
d. during old age, before they die

1. the hair shaft is composed of what important protein?

a. myosin.
b. keratin.
c. chitin.
d. actin

Explanation:

1. Asbestos is durable and long - lasting, which makes it suitable for applications like around pipes, fireplaces, etc. It is fire - resistant (so c is wrong), and handling asbestos is not easy (d is wrong). While it can be molded (b), its durability is a more prominent property for these uses.
2. When searching for fiber evidence, the first step is to visually search the area. Using an infrared spectroscope (a) is a later analysis step. Crawling with forceps (b) and using a vacuum (d) are not the first steps.
3. Infrared Spectroscopy is non - destructive, so it is used when there is a limited amount of fiber evidence. Chromatography (a) can be destructive, density test (c) and solvent test (d) may also damage the sample.
4. Hemp comes from the stem of the plant. Seed (a) gives hemp seeds, fruit (c) and leaf (d) are not the sources.
5. Cotton comes from the seed of the cotton plant. Stem (b) gives other fibers like hemp, fruit (c) and leaf (d) are not the sources.
6. Humans have the most hair on their body when they reach sexual maturity and adulthood. At birth (a), during puberty (c) (hair is still developing), and old age (d) (hair may start to thin) are not the times of maximum hair.
7. The hair shaft is composed of keratin. Myosin (a) is in muscles, chitin (c) is in exoskeletons, actin (d) is in muscles.

Answer:

1. A. It is durable and long lasting
2. C. Visually search the area
3. B. Infrared Spectroscopy
4. B. Stem
5. A. Seed
6. B. Once they reach sexual maturity and adulthood
7. B. Keratin