Hair and Fiber Quiz Review

Natural fibers can be harvested from

• plants and animals

• only plants

• only animals

• plants, animals and sometimes inorganic substances.

Fibers are an excellent source of trace evidence because:

• they are easily transferred from victim to suspect

• they are often overlooked by a suspect

• they can be easily collected and stored

• all of the answers are correct

Three things to consider when using fiber as evidence are:

• Fiber is considered class evidence, fiber is commonly left at crime scenes, and provides probative value.

• Fiber is considered individual evidence, fiber is commonly left at crime scenes, and provides probative value.

• Fiber is considered class evidence, fiber is rarely left at crime scenes, and provides probative value.

• Fiber is considered class evidence, provides insignificant value, and fiber is commonly left at crime scenes.

What is the correct order of how fiber is made?

• fabric --› filament --› fiber

• fiber --› filament --› fabric

• filament --› fiber --› fabric

• filament --› fabric --› fiber

Two methods of determining different fiber types include:

• cuticle analysis and burning

• microscopic observation and mitochondrial analysis

• chemical testing and burning

• thermal decomposition and gel electrophoresis

The hair shaft is composed of the cuticle, cortex, and

• medulla

• root

• crown

• granules

Which part(s) of a hair can be analyzed for DNA?

• root

• cuticle

• medulla

• cortex

The period of active hair growth is called the ___________ stage.

• catagen

• telogen

• anagen

• imagen

What are all the reasons that hair is a valuable piece of evidence?

• It is considered trace evidence, it has a wide range of characteristics, and it is persistent.

• It contains genomic DNA in the hair shaft, it resists degradation, and it is commonly found at crime scenes.

• It has a wide range of characteristics, it contains genomic DNA in the hair shaft, it is persistent, and it is considered trace evidence.

• It has a wide range of characteristics, it is persistent, it resists degradation, and it is commonly found at crime scenes.

A crime scene from 25 years ago was re-examined and one strand of hair (without the root) was found on the couch. What type of DNA can be obtained from this hair shaft?

• nuclear DNA

• cytoplasmic DNA

• chloroplast DNA

• mitochondrial DNA