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Forensic Chemistry Final Review
Random Questions
180
Chemistry
Undergraduate 4
12/04/2009

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Term
Final Review
Definition
Term
What is the definition of point of convergence
Definition
2 dimensional surface over which the direction of several bloodstains can be retraced
Term

What are the three major classes of fingerprint patterns

 

Definition
loops, whorl, arch
Term
the technology of DNA typing has its beggiing in 1985 with the work of
Definition
Alec Jeffery
Term
What is the most common ridge pattern
Definition
loop
Term
The _____is the original part of the bore left after rifling grooves are formed
Definition
Land
Term
_____ in the fluid portion of unclotted blood
Definition
Plasma
Term
How many different bases are associated with the make up of DNA
Definition
4 ATGC
Term
As blood stains form at more and more acute angles, what happens to the shape of the blood
Definition
become more elongated
Term
What is the number od deltas found in a typical arch pattern
Definition
Zero
Term
The diameter of the gun barrel is known as it's
Definition
Caliber
Term
Assume that won strands of DNA have been seperated and that the base sequence on one strand is A-T-G-C. What is the sequence of bases on the second strand?
Definition
T-A-C-G
Term
The liquid that separated from the blood when a clot is formed is called
Definition
Serum
Term
The number of lands and grooves is a ___ characteristic of a barrel.
Definition
Class
Term
At what time area are a person's finger prints formed
Definition
Fetal Development
Term
The production if amino acid is coded by a sequence of hoe many bases on the DNA molecule?
Definition
3
Term
Fingerprints develope on what layer of skin
Definition
Dermal papillae
Term
When a droplet of blood strikes a surface at an angle perpendicular to that surface, what is the shape of the blood stain
Definition
circle
Term
Portions of the DNA molecules useful for DNA typing
Definition
non-coding DNA frags that are repeated many times
Term
The_____characteristics of a rifled barrel are formed by striations impressed in the barrel's surface.
Definition
individual
Term
Sweat glands on the surfaces of the hands and feet do not produce oil?
Definition
True
Term
_____transport oxygen from the lungs to the body tissues and carry carbon dioxide back to the lungs
Definition
RBC
Term
The most important instrument for comparing bullets is the
Definition
Comparison microscope
Term
DNA is a polymer - What is the repeating unit (monomer) of DNA
Definition
True: Nucleotide
Term
On bullets fired in succession from the same weapon, all of the individual characteristics are always identical
Definition
false
Term
What is the fingerprint classification system that is used in england-speaking countries
Definition
Henry System
Term
_____ velocity blood spatter usually has less then 1mm in diameter size range.
Definition
High
Term
It is____ possible to determine the make of a weapon by examining a bullet it fired
Definition
sometimes
Term
The experience of the investigator can determine the minimun number of ridge characteristics needed to match two fingerprints
Definition
True
Term
What are components of a nucleotides?
Definition
Nitrogenous bases: phosphorous containing, sugar, nitrogen base
Term
On the surface of RBC are chemical substances called____which impart blood type characterristics to the cells
Definition
Antigen
Term
What is the technique that can produce many copies of segments of DNA?
Definition
PCR
Term
A shotgun has a_____barrel
Definition
smooth
Term
What is the computerize system for storing fingerprints?
Definition
AFIS
Term
_____Velocity blood spatter usually falls in 1-4 mm in diameter size range
Definition
Medium
Term
In a DNA process, the transfer of DNA fragments onto a nylon membrant is called what?
Definition
Southern blotting
Term
The diameter of a shotgun barrel is expressed by the term
Definition
gauge
Term
Type A individuals have____and____ antigens on the RBCs
Definition
A;
Term
Prints that are not readily visible or known as
Definition
latent
Term
Shotgun pellets can be individualized to a single weapon
Definition
false
Term
During gel electrophoresis the DNA is separated by
Definition
fragment size
Term
What could be the cause of high celocity blood spatter
Definition
gun shot
Term
A cartridge case(can, can't) be individualized to a single weaopm
Definition
can
Term
_______probes are used to visualize RFLP DNA fragments
Definition
radioactive
Term
Type O individuals have (both, neither) A and B antigens on their RBCs
Definition
neither
Term
t or f: the shape of the indentation caused by the firing pin may be a characteristic peculiar to a firearm
Definition
true
Term
prints impressed into a bar of soap are known as
Definition
plastic
Term
The rate at which large DNA fragments move through the electrophoresis gel is____the rate which small DNA fragments move through the same gel
Definition
less than
Term
t or f: The distribution of gunpowder particles and other discharge from which the gun was fired
Definition
true
Term
What could be the cause of high velocity blood spatter
Definition
gun shot
Term
t or f: Without the benifits of a weapon, an examiner can mane an exact determination of firing distance
Definition
false
Term
what fingerprinting method can be used on hard, on porous surfaces
Definition
super glue fuming
Term
An_______photograph may help visualize gunpowder deposits around a target.
Definition
infrared
Term
What are advantages of working with shore DNA fragments
Definition

more stable

less likely to break apart

quantity ampliified with PCR

less subject to degradation

Term
The presence or absence of the ___ and ___ antigens on the RBC's determines a person's blood type in the A-B-O system
Definition
A;B
Term
Current methods for identifying a shooter rely on the detection of(primer, gunpowder) residues on the hands.
Definition
primer
Term
The Discrimination power of mitochondrial DNA is____the discrimination power of STR analysis
Definition
less than
Term
What is an example of hard, nonporous surface?
Definition
glass, metal
Term
Determining whether an individual has fired a weapon is done by measuring the elements_____and _____present on the hands.
Definition
barium; antimony
Term
What are the names of three types of impace spatter
Definition
low, medium, high
Term
STR normally consists of repeating sequences of____bases
Definition
3-7
Term
t or f: Firings with all types of ammunition can be detection by hand swabbing with nitric acid
Definition
false
Term
What is an example of a hard, non porous surface?
Definition
glass, metal
Term
The D antigen is also known as the___antigen
Definition
Rh
Term
t or f: Restoration of serial numbers is possible because in the stamped zone the metal is placed under a permanent strain that extends beneath the original numbers
Definition
true
Term
How many regions of mitochondrial DNA have been found to be highly variable in the human population
Definition
2
Term
what is the definition of projected bloodstain
Definition
subjected to an action of force reater than gravity
Term
What fingerprinting methods can be used on soft, porous surfaces
Definition

iodine fuming

ninhydrin

gentian(i dunno man)

Term
What is the national system of share DNA databases of DNA typing information from convicted criminals and crime scene evidence
Definition
CODIS
Term
What is an example of a soft porous surface
Definition
paper, cloth
Term
What are steps in a DNA RFLP typing process
Definition

Digestion w/ restrictive enzyme

electrophoresis

southern blotting

hydrization w/ radioactive probe

process w/ e-ray film

Term
Serum contains proteins known as ___which destroy or inactivate antigens
Definition
antibody
Term
The technology of DNA typing had it beginning 1985 with the work of________
Definition
Alec Jeffery
Term
Sublimation occurs with the use of what lifting methos
Definition
iodine fuming
Term
Give two examples of projected blood stains
Definition
gush, cast off
Term
how many different bases are associated with the makee-up of DNA
Definition
4
Term
An antibody reacts with(any, only specific) antigen.
Definition
only specific
Term
Ninhydrin is used to detect what molecule in latent fingerprints?
Definition
amino acid
Term
The fundamental unit of heredity is the
Definition
gene
Term
What is the definition of a transfer blood stain?
Definition
when one bloody surface comes in contact w/ another
Term
Superglue Fuming is suitable for(hard and nonporous, soft and porous) surfaces
Definition
hard and nonporous
Term
A_____is a very large molecule made by linking a series of repeating units.
Definition
polymer
Term
t or f: agglutination describes the clumping together of RBCs by the action of an antibody.
Definition
true
Term
A________is composed of a sugar molecule, phosphorus- containing group, and a nitrogen-containing molecule called a base
Definition
nucleotide
Term
Give me two examples of a transfer blood stain
Definition
swipe, smudge
Term
What fingerprinting method produces a temporary orange/ brown prints
Definition
iodine fuming
Term
Each gene is actually composed of____. specifically designed to carry out a single body function.
Definition
DNA
Term
Type B blood contains____antigens and ainti____antibodies
Definition
B;A
Term
DNA is actually a very large molecule made by linking a series of_____to form a natural polymer
Definition
nucleotide
Term
What chemical treatment produced a white-appearing permanent fingerprint
Definition
superglue
Term
What is the definition of a passive blood stain
Definition
formed by gravity acting alone
Term
_____different basses are associated with the makeup of DNA
Definition
Term
What fingerprinting method produces a permanent purple or violet print?
Definition
ninhydrin
Term
The first systematic attempt at personal identification was devised and introduced by
Definition
Bertillon
Term
Type AB blood has (both, neither) anti-a(and, nor) anti-b
Definition
both; and
Term
Watson and Crick demonstrated that DNA is composed of two strands coiled into the shaped of a _____
Definition
double helix
Term
A system of identification relying on precise body measurements is known as______
Definition
Anthropometry
Term
Give two examples of a passive bloodstain
Definition
drip, pool
Term
The structure of DNA requires the pairing of base A to ___and base G to ___
Definition
t;c
Term
The fingerprint classification system used  in most English speaking countries was devised by
Definition
Sir. Ed. Rick Henry
Term
The term _____describes the study of antigen-antibody reactions.
Definition
Sereology
Term
The bases sequence TGCA can be paired with the base sequence
Definition
ACGT
Term
What are the four components of blood?
Definition
plasma, plate RBC NBC
Term

The individuality of a fingerprint(is, isnt) determined by patterns.

 

Definition
is
Term
The inheritable traits that are controlled by DNA arise out of DNA's abillity to direct the production of
Definition
Term
Type AB blood(is, isnt) agglutinated by both anti-a and antib serum
Definition
is not
Term
A point-by-point comparison of fingerprint's_____must be demonstrated in order to prove identity.
Definition
ridge characteristic
Term
_____ are derived from a combination of up too twenty known amino acids
Definition
proteins
Term
_____are a reproduction of friction skin ridge
Definition
fingerprints
Term
What is the percentage of blood lost from the body that would cause death
Definition
Term
The production of an amino acid is controlled by a sequence of___bases on the DNA molecule
Definition
40%
Term
The form and pattern of skin ridge are determined by the__________
Definition
dermal papillae
Term
A person that is blod type B can receive what blood type in a transfusion?
Definition
Term
t or f: Enzymes known as DNA polymerase assemble new DNA strands into a proper base sequence during replication.
Definition
Term
Type B RBCs agglutinate when added to type(A, B) blood.
Definition
B-, O-
Term
A permanent scar forms in the skin only when an injury damages the______
Definition
Dermal papillae
Term
t or f: DNA can be copied outside a living cell
Definition
true
Term
A person that is blood type B can recieve what blood type in a tranfusion
Definition
B,O
Term
Fingerprints(can,can not)be changed during a person's lifetime
Definition
can not
Term
Recombinant DNA relies on the ability of chemicals known as ______enzymes to cut DNA into fragments
Definition
restriction
Term
Type A RBCs agglutinate when added to type (AB, O) blood.
Definition
O
Term
The three general patterns into which fingerprints are divided are____,_____, and______
Definition
whurls, archs, and loops
Term
A person that is blood type A has what antibody is serum?
Definition
anti B
Term
The most common fingerprint pattern is the ____
Definition
loops
Term
In RFLP DNA typing, restriction enzymes are used to cut out(repeating, random) sequences from the DNA molecule
Definition
repeating
Term
Approximately 5% of the population has the____ fingerprint pattern
Definition
arch
Term
An immunological assay technique used to detect the presence of the minute quantities of drugs in blood and urine is ____ or ____.
Definition
EMIT or RIA
Term
A loop pattern that opens toward the thumb is known as a ___ loop
Definition
radical
Term
In RFLP DNA typing, restriction enzymes are used to cut out sequences of DNA with different(widths, lengths)
Definition
lengths
Term
What is the definition of agglutination
Definition
clumps together
Term
The pattern area of the loop is enclosed by two diverging ridges known as _____
Definition
type lines
Term
DNA fragmens can be sorted according to their size by the technique of ______
Definition
electrophoresis
Term
______reagent reacts with blood, causing it to luminesce
Definition
Uminol
Term
The ridge point nearest the typ-line divergence is know as the ______
Definition
delta
Term
In the RFLP DNA typing process, DNA fragments are transferred to a nylon membrane by a process called ____blotting
Definition
southern
Term
What are the 8 different blood types that a human could have
Definition
[+-]a,b,ab,o
Term
All loops must have ____delta
Definition
one
Term
t or f:In the FRLP DNA typing process, a radioactively labeled probe is used to visualize the seperated DNA fragments
Definition
true
Term
Blood can be characterized as being of human origin by the ______ test
Definition
percipitive
Term
The approximate center of a loop pattern is called____
Definition
the cure(spelling)
Term
The probe complementary to the bases sequences TAG has the letter sequence ____
Definition
ATC
Term
t or f: The shape of blood stains may provide useful information reguarding the direction, dropping distance, and angle of impact for spattered blood
Definition
Term
If an imaginary line drawn between the two deltas or whorl pattern touches any of the spiral ridges, the pattern is classified as a_____
Definition
plain whorl
Term
The basic unit of heredity is the
Definition
gene
Term
In RFLP DNA typing, a typical DNA pattern shows(two, three) bands.
Definition
two
Term
The simplest of all fingerprint patterns in the _____
Definition
Plain arch
Term
Genes are position on threadlike bodies called______
Definition
chromosomes
Term
t or f: Specimens amendable to DNA typing are blood, semen body tissues, and hair
Definition
true
Term
Arches(have, dont have) type lines, deltas, and crops
Definition
have no
Term
all cells in the human body, except the reproductive cells have ___ pairs of chromosomes.
Definition
23
Term
Short DNA segments containing repeating sequences of three to seven bases are called ___.
Definition
STRs
Term
The presence or absence of the _____ is used as a basis for determining the primary classification in the Henry system.
Definition
whorl pattern
Term
The sex of an offspring is always determined by the (father, mother)
Definition
father
Term
t or f: The longer the DNA strand, the less susceptible it is to degradation.
Definition
false
Term
Genes that influence a given characteristic and are aligned with one another on a chromosome pair asr known as
Definition
anelles
Term
A fingerprint classification system(can, can not) unequivocally identify an individual.
Definition
can not
Term
The short length of STRs allows tem to be replaced by ____
Definition
PCR
Term
A _____ is an observable characteristic of an individual
Definition
phenotype
Term
DNA fragments can be separated and identified by______
Definition
capillary electrophoresis
Term
t or f: Computerized fingerprint search systems match prints by comparing the position of bifurcation and ridge endings.
Definition
true
Term
The combination of genes present in the cells of an individual in called the_____
Definition
genotype
Term
A fingerprint left by a person with soiled or stained fingerprints is called a
Definition
visible print
Term
Mitochondrial DNA is inherited from the (mother, father)
Definition
Mother
Term
A gene(will, will not) appear in a child when it is present in one of the parents
Definition
will
Term
________fingerprints are impressions left on a soft material
Definition
plastic
Term
t or f: Mitochondrial DNA in more plentiful in the human cell than is nuclear DNA.
Definition
true
Term
A type B individual may have the genotype___ or the genotype___
Definition
BB; BO
Term
Fingerprints on hard and nonabsorbent surfaces are best developed by the application of a_____
Definition
powder
Term
____regions of mitochondrial DNA have been found to be highly variable in human populations
Definition
2
Term
Fingerprints on porous surfaces are best developed with _________ treatments
Definition
Chemical
Term
T or F: Polymerase chain reaction is a part of the process used in the forensic analysis of RFLP, STRs, and mitochondrial
Definition
false
Term
______vapors chemically combine with fatty oils or residual water to visualize a fingerprint.
Definition
Iodine
Term
A type AB mother and the AB father will have offspring of what possible genotypes(combo)
Definition
AA, AB, BB
Term
The national DNA database in the US has standardized on _____ STRs for entry into the database
Definition
13
Term
The Chemical_______visualizes fingerprints by its reaction with amino acids.
Definition
ninhydrin
Term
A type AB mother and type AB father will have offspring of what possible phenotypes
Definition
A, B, AB
Term
Small amounts of Blood are best submitted to a crime laboratory in ____conditions
Definition
dry
Term
t or f: Airtight packages make the best containers for blood-containing evidence.
Definition
false
Term
A typical STR DNA type emanating from a single indivdual shows a ____-band pattern.
Definition
two
Term
A chemical technique known as ________is used to develope latent prints on nonporous surfaces such as metal and plastic.
Definition
Superglue Fuming
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