final Flashcards
When a forensic analyst determine the chemical composition of preparations that may contain illicit drugs such as heroin, cocaine or barbiturates, this is an example of:
Identification
Which of the following properties should not be examined when comparing two synthetic fibers?
Medullary Index
Assume that two strands of DNA have been separated and that the base sequence on one of strand is ATGC. What is the sequence of bases on the second strand?
TACG
In the PCR process, the first step is to heat the DNA strands. This is to permit theL
Double Stranded molecules to separate completely.
The rate at which large DNA fragments move through the electrophoretic gel is _____ the rate at which small DNA fragments move through the same apparatus
Less than
Fingerprints that are not readily visible are commonly referred to as:
Latent
Which feature of hair is MOST important in making a species identification?
Scale Pattern
DNA is a
polymer
which instrument are you going to use in the lab to characterize flammable residues?
Gas Chromatography
To analyse blood for alcohol, you will use:
Gas Chromatography
A microscope uses a combination of _____ to magnify an image
Lenses
As the magnifying power of the compound microscope increases, the depth of the focus:
decreases
Which of the following types of fingerprints is most likely to be found impressed in soft wax?
Plastic
DNA analysts are able to examine samples containing as few as _____ cells from an STR profile
18
The technology of DNA typing had its beginning in 1985 with the work ofL
Alec Jeffreys
The amount of DNA material required for STR analysis is ____ the amount of DNA required for RFLP analysis
Less than
A transparent specimen is viewed through a microscope using ____ light while an opaque object requires ____ illumination
Transmitted
Vertical
The examination of a paint chip found on a hit and run victims garment side by side with paint removed from a vehicle suspected of being involved in the incident is an example of:
Comparison
A compound microscope is equipped with to objective lenses (10x and 45x) and has a 10x ocular lens. The highest magnification attainable with this instrument is:
450x
Which instrument are you going to use in the lab to identify drugs?
IR
As the magnification of the compound microscope is increased, the field of view:
decreases
Which type pf crime is LEAST likely to be solved by the use of fiber evidence?
Bombing
How many different types of bases are associated with the make up of DNA?
4
Which microscope plots an absorption spectrum of the item under examination?
Microspectrophotometer
PCR is a technique that:
Can produce many exact copies of segments of DNA
True of False:
Two hairs from the same head may not have the same morphological characteristics?
True
Prints impressed in a bar of soap are referred to as:
plastic
Nuclear DNA typing can be most successfully accomplished on hairs that have been removed during which stage of growth?
Anagenic
In DNA replication, polymerases:
Help assemble the new DNA strands in proper base sequence
The size of the specimen are in view is known as the
Field of View
The building blocks of the NDA molecules are known as
Nucleotides
The central canal running through many hairs is known as the:
Medulla
Medullae may be classified as:
Interrupted
Absent
Continuous
Fragmented
In order to examine an opaque with a compound microscope, one must:
Use reflected illumination
Pigment granules that impart hair with color are found in the
Cortex
The microscope examination of a bullet requires
Reflected light
The amplification of DNA use the Thermal Cycler take approximately:
30 cycles
In determination whether a hair sample originated from a male or female, the MOST important consideration is
The results of DNA analysis performed on the root structure
An object with the letter “L” is viewed under low power of a compound microscope. The image would appear as:
mirrored and upside down “7”
Which of the following is not a layer of the hair shaft?
Follicle
Which is an advantage of working with short DNA fragments
- more stable and less likely to break apart
- less subject to degradation
- quantity can be greatly ampified by PCR technology
What are the correct base-pairing in DNA?
T-A
G-C
The most important tool of the firearms examiner is the:
Comparison Microscope
Which microscope provides a right-side-up image?
Stereocopic
The most common ridge patter is the:
loop
The magnification power of a microscope equals the magnifying power of the:
(objective lens)*(eyepiece lens)
If a hair does not have a follicular tag, an expert witness is on best scientific footing when stating that:
The suspect hair comes from a particular animal species
Which chemical treatment produced a white-appearing latent print?
Superglue Fuming
Which microscope has the largest potential working distance?
Stereoscopic
