The number of hair scales pointing towards the tip of the hair is ____ the number of hair scales pointing towards the hair follicle
If a hair does not have a follicular tag, an expert witness is on best scientific footing when stating that:
A suspect hair comes from a particular animal species
A hair sample was examined and its medulla appeared to have a pattern described as resembling a string of earls. It was most likely from a:
The removal of an object or surface that was located between the origin of blood and the target surface during the bloodstain deposition leaves behind:
In determining whether a hair sample originated from a male or a female, the most important consideration is:
The results of DNA analysis performed on the root structure
The presence of sheath cells on hair that has been pulled quickly form the head is ___ the presence of sheath cells on hairs that have been removed slowly form the scalp
Nuclear DNA typing can be most successfully accomplished on hairs that have been removed during which of stage of growth?
The conviction of Ennis Cosby's killer was aided by the DNA analysis on a hair that that was crucial evidence in that case. This hair:
Belonged to the killer and was found in his cap with which he had wrapped the murder weapon before discarding it.
Telltale signs of arson include:
Separate points of origin, streamers connecting burned areas, the presence of accelerant containers, trails of burn patterns
Factors that can contribute to abnormal observations at a fire scene include:
Stairways on elevator shafts, winds or drafts, secondary fires due to collapsing floors or roof, holes in the structure
The rapid combination of oxygen with a fuel, which produces a noticeable release of energy is called:
The minimum temperature at which a liquid fuel will produce enough vapor to burn is called the
The concentrations at which a vapor to fuel mixture in the air is capable of burning is referred to as the
What instrumentation is considered the most sensitive are reliable for detecting and characterizing flammable residues
The number of hair scales pointing towards the tip of the hair is:
Greater than the number of scales pointing towards the follicle
If hair does not have a follicular tag, an expert witness is on best scientific footing when stating that:
A suspect hair comes from a particular animal species
A hair sample was examined and its medullae appeared to have a pattern described as resembling a string of pearls. It was most likely from a:
The removal of an object or surface that was located between the origin of blood and the target surface during the bloodstain deposition leaves behind?
In determining whether a hair sample originated from a male of female, the most important consideration is:
The results of the DNA analysis performed on the root structure
The presence of sheath cells on hair that has been pulled quickly from the head is?
Greater than the presence of sheath cells on hairs that have been removed slowly from the scalp
Nuclear DNA typing can be most successfully accomplished on hairs that have been removed during which stage of growth?
The conviction of Ennis Cosby's killer was aided by the DNA analysis on a hair that was crucial evidence in the case, this hair belonged to who?
The killed and was found in his cap with which he had wrapped the murder weapon before discarding it.
2 factors that affect the rate of a chemical reaction
1. physical state of a fuel.
2. fuel temperature
3 ways a criminilist can ascertain that a fire was started by an arsonist
1. accelerants left behind
2. finding an origin or multiple origins
3. streamers connecting burned areas
caused by a natural heat producing process in the presence of air and fuel. example is a forest fire and hay buring in a barn.
occurs on the surface of a solid in the absence of heat and light. ex- charcoal on a grill.
the amount of spatter from a blood droplet falling on a hard non porus surface is _____ than that of a srop of blood falling onto a softer porus surface
by counting and pairiingthe patterns of a _____ pattern an investigator can estimate the minimum amount of blows inflicted on the victim
the intersection of straight linnes through a long axis of serveral bloodstains in an impact spatter pattern ilustrates the ___ of the pattern
area of convergence
at a crime scene, the srting method is used to find the ____ of an impact spatter pattern
area of origin
the deposition of bacwards spatter produced by a gunshot wound is determined by...
the location of the injury
the location of the surface of deposition
the distance between the victim and the muzzle
the size of the wound created
the pressure of the pumping of oxygenated blood out of an injury ccauses brihgt red colored blood to spurt out and form what?
ane expirated blood pattern at a crime scene can be identified by?
bubbles of oxegyn within the pattern
widely spaced bloody shoeprints with satellitespatter between them were likey deposited by a person who was what?
the direction of a ______ maay show movements of objects or bodies while the pattern was still forming or after the blood has dired.
the approx dring time of a pool of blood can be used to estimate timing pf events at a crime scene and is dependent on what?
proper location and documentation of bloodstain patterns at the crime scene is the responsibility of?
criminilists and specialists
area of origin
in a three dimensional space illustrates the position of the victim or suspect when the stain producing event took place
two ways to identify expirated blood
more diluted wiht saliva - lighter color
more oxegyn in the blood
negative effects of building wind turbines?
they need to be built in an area with lots of wind. birds die when they fly thorugh it.
viscosity is the reluctance of a liquid to flow. water has a low viscosity, while syrup has a high viscosity.
specific heat capacity
the time it takes for a liquid to heat and cool. water has a high shc meaning it takes a long time to heat and cool.
when things like nitrates and phospates are added into bodies of water in too much quantity and spark the growth of too much algae the algaes up all the oxegyn int eh water adn causes marine life to suffocate
when water on the surface of an object is being pulled only downwards not up, so if carefully placed, something with a higher density than water can rest on top of water ( like insects) because of the tension on the surface ( surface tenion)
force of attraction between a hydren atom of one molecule of water and the oxegyn, nitrogen or fourine.
what are the five major stepsin water purification
screening filtration settling florination and chlorination
the trasformation froma gas to a liquid.an example would be water on the outside of a glass.
the transformation froma gas to a solid without going through the liquid phase. an example is dry ice (solid co2)
he percentage of salt in water or a liquid, a human can comsume water with a percentage of 2.2% and oceans have 3.5
describe an unusual property of water when it freezes
an ususual property of water when it freexes is that it expands and that it is less dense when it is in its solid form.
what is the name of the illness associated with high levels of mercury in the fish in japan?
degine alloy and give an example?
an alloy is a compound that contains 2 or more different metals . an example is steel which contans cobalt nickel and iron.
name 2 gases that are very harmful which are found in car exhausts?
nitrogen dioxide and carbon monoxide
a substance that will funny break down into the earth adn example is frut and vegetable skin
what is the differnece between adsorbtion and absorption?
absorption is when something is being pushed into the substance absorbing. an example is a sponge.
adsorption it when water attaches to the surface of an object.
why do icebergs contain very little salt?
icebergs contain very little salt because when you freeze something it decreases the amount of salt in the substance and becuase icebergs are cold they have little salt.
name the two most common sources that are responsible for the rapid overgrowth of algae in rivers and lakes
phosphates and nitrates
a person must undergo ______ if thier kidneys fail while they wait for a kidney transplant.
what is the name of the device found in the exhaust of a car that removes nitrogen oxide and carbon monoxide from the car exhaust fumes
in tokyo, what much a buyer prove before they can buy a car
they must prove that they have a place to park it