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WorksheetsForensics 2022 3rd 9 Weeks Test
Total questions: 20
Worksheet time: 10mins
The uniqueness of mtDNA in a family is _____, compared to nDNA.
lower
higher
cannot be determined
Which component of DNA forms the backbone of the molecule?
phosphate group
sugar
nitrogenous base
Both phosphate group and sugar
PCR is a technique that:
provides a statistical analysis of the sequence of the nitrogenous-base pairings.
virtually eliminates operator error from DNA analysis.
can produce many exact copies of segments of DNA.
all of these
STRs normally consist of repeating sequences of:
3-7 bases.
18-20 bases.
13-17 bases.
1-2 bases.
Depending on the circumstances which unique characteristic of mitochondrial DNA and/or the analysis of it can be considered an advantage or a disadvantage?
mtDNA analysis is more sensitive than nuclear DNA analysis.
mtDNA is not found in the nucleus of the cell but in the mitochondria.
All individuals of the same maternal lineage will be indistinguishable by mtDNA analysis.
Because each human cell contains hundreds to thousands of mitochondria, then there are hundreds to thousands of copies of mtDNA.
At the crime scene, the string method is used to find the _____ of an impact spatter pattern.
void pattern
drying time
area of convergence
area of origin
An expirated blood pattern at a crime scene is identified by:
bubbles of oxygen within the pattern.
lighter color than other patterns.
skeletonized edges.
both lighter color than other patterns and skeletonized edges.
The pointed end of a bloodstain always faces:
in its direction of travel.
toward the direction from which the force came.
opposite its direction of travel.
toward the position of the blood source.
Which of the following is of paramount importance in the interpretation of bloodstain patterns?
The direction of impact
The surface texture
The angle of impact
The amount of blood
A trail pattern leading away from the victim at a stabbing scene was most likely created by:
a victim's arterial wound.
postmortem movement of the victim.
blood dripping from the murder weapon.
the swinging of the murder weapon between strikes.
Which feature of hair is MOST important in making a species identification?
scale pattern
follicle shape
bulb size
color
In determining whether a hair sample originated from a male or a female, the MOST important consideration is:
the length of the hair.
the results of DNA analysis performed on the root structure.
whether the hair was dyed.
whether the hair is curly or straight.
A cast of a hair surface can be made using:
an scanning electron microscope (SEM).
clear nail polish.
softened vinyl.
both clear nail polish and softened vinyl.
During the collection of fiber evidence, great care should be taken to:
avoid cross-contamination of evidence.
send as much potential evidence as possible to the crime lab to ensure that nothing is missed.
package all items from each individual together in one bag to avoid later confusion.
shake off all garments to be sent for examination before neatly folding them.
Nuclear DNA typing can be most successfully accomplished on hairs that have been removed during which stage of growth?
anxiogenic
anagenic
mutagenic
catagenic
Under which circumstances have two people been found to have identical fingerprints?
Siamese twins
identical twins
fraternal twins
none to date
What is the minimum number of ridge characteristics necessary before two fingerprints can be identified as the same?
16
22
10
No minimum exists. Final determination must be made based on experience and knowledge of the expert.
In the primary classification system, a finger is assigned numerical value if its pattern is a(n):
thumb.
whorl.
arch.
loop.
Which chemical treatment produces a white-appearing latent print?
superglue fuming
iodine fuming
ninhydrin
crystal violet
Prints that are NOT readily visible are commonly referred to as:
rolled.
obscured.
plastic.
latent.
